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617e2b2636
gecko/widget/nsIWidget.h
Phil Ringnalda 617e2b2636 Backed out 7 changesets (bug 946958, bug 865033) 
Backed out changeset 6dd0a6cb9ab3 (bug 946958)
Backed out changeset 498152aec5b1 (bug 946958)
Backed out changeset 7d035322f51d (bug 946958)
Backed out changeset 99f8ad7561ef (bug 946958)
Backed out changeset 4639c5abea80 (bug 946958)
Backed out changeset 9d1a4d83eccf (bug 865033)
Backed out changeset 41839e4026bc (bug 865033)
2013-12-08 18:43:45 -08:00

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/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsIWidget_h__
#define nsIWidget_h__
#include "nsISupports.h"
#include "nsColor.h"
#include "nsRect.h"
#include "nsStringGlue.h"
#include "nsCOMPtr.h"
#include "nsWidgetInitData.h"
#include "nsTArray.h"
#include "nsXULAppAPI.h"
#include "mozilla/EventForwards.h"
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/RefPtr.h"
#include "Units.h"
// forward declarations
class nsFontMetrics;
class nsRenderingContext;
class nsDeviceContext;
struct nsFont;
class nsIRollupListener;
class imgIContainer;
class gfxASurface;
class nsIContent;
class ViewWrapper;
class nsIWidgetListener;
class nsIntRegion;
namespace mozilla {
namespace dom {
class TabChild;
}
namespace layers {
class Composer2D;
class CompositorChild;
class LayerManager;
class PLayerTransactionChild;
}
namespace gfx {
class DrawTarget;
}
}
/**
* Callback function that processes events.
*
* The argument is actually a subtype (subclass) of WidgetEvent which carries
* platform specific information about the event. Platform specific code
* knows how to deal with it.
*
* The return value determines whether or not the default action should take
* place.
*/
typedef nsEventStatus (* EVENT_CALLBACK)(mozilla::WidgetGUIEvent* aEvent);
// Hide the native window system's real window type so as to avoid
// including native window system types and APIs. This is necessary
// to ensure cross-platform code.
typedef void* nsNativeWidget;
/**
* Flags for the getNativeData function.
* See getNativeData()
*/
#define NS_NATIVE_WINDOW 0
#define NS_NATIVE_GRAPHIC 1
#define NS_NATIVE_TMP_WINDOW 2
#define NS_NATIVE_WIDGET 3
#define NS_NATIVE_DISPLAY 4
#define NS_NATIVE_REGION 5
#define NS_NATIVE_OFFSETX 6
#define NS_NATIVE_OFFSETY 7
#define NS_NATIVE_PLUGIN_PORT 8
#define NS_NATIVE_SCREEN 9
// The toplevel GtkWidget containing this nsIWidget:
#define NS_NATIVE_SHELLWIDGET 10
// Has to match to NPNVnetscapeWindow, and shareable across processes
// HWND on Windows and XID on X11
#define NS_NATIVE_SHAREABLE_WINDOW 11
#ifdef XP_MACOSX
#define NS_NATIVE_PLUGIN_PORT_QD 100
#define NS_NATIVE_PLUGIN_PORT_CG 101
#endif
#ifdef XP_WIN
#define NS_NATIVE_TSF_THREAD_MGR 100
#define NS_NATIVE_TSF_CATEGORY_MGR 101
#define NS_NATIVE_TSF_DISPLAY_ATTR_MGR 102
#define NS_NATIVE_ICOREWINDOW 103 // winrt specific
#endif
#define NS_IWIDGET_IID \
{ 0xa1f684e6, 0x2ae1, 0x4513, \
{ 0xb6, 0x89, 0xf4, 0xd4, 0xfe, 0x9d, 0x2c, 0xdb } }
/*
* Window shadow styles
* Also used for the -moz-window-shadow CSS property
*/
#define NS_STYLE_WINDOW_SHADOW_NONE 0
#define NS_STYLE_WINDOW_SHADOW_DEFAULT 1
#define NS_STYLE_WINDOW_SHADOW_MENU 2
#define NS_STYLE_WINDOW_SHADOW_TOOLTIP 3
#define NS_STYLE_WINDOW_SHADOW_SHEET 4
/**
* Transparency modes
*/
enum nsTransparencyMode {
eTransparencyOpaque = 0, // Fully opaque
eTransparencyTransparent, // Parts of the window may be transparent
eTransparencyGlass, // Transparent parts of the window have Vista AeroGlass effect applied
eTransparencyBorderlessGlass // As above, but without a border around the opaque areas when there would otherwise be one with eTransparencyGlass
};
/**
* Cursor types.
*/
enum nsCursor { ///(normal cursor, usually rendered as an arrow)
eCursor_standard,
///(system is busy, usually rendered as a hourglass or watch)
eCursor_wait,
///(Selecting something, usually rendered as an IBeam)
eCursor_select,
///(can hyper-link, usually rendered as a human hand)
eCursor_hyperlink,
///(north/south/west/east edge sizing)
eCursor_n_resize,
eCursor_s_resize,
eCursor_w_resize,
eCursor_e_resize,
///(corner sizing)
eCursor_nw_resize,
eCursor_se_resize,
eCursor_ne_resize,
eCursor_sw_resize,
eCursor_crosshair,
eCursor_move,
eCursor_help,
eCursor_copy, // CSS3
eCursor_alias,
eCursor_context_menu,
eCursor_cell,
eCursor_grab,
eCursor_grabbing,
eCursor_spinning,
eCursor_zoom_in,
eCursor_zoom_out,
eCursor_not_allowed,
eCursor_col_resize,
eCursor_row_resize,
eCursor_no_drop,
eCursor_vertical_text,
eCursor_all_scroll,
eCursor_nesw_resize,
eCursor_nwse_resize,
eCursor_ns_resize,
eCursor_ew_resize,
eCursor_none,
// This one better be the last one in this list.
eCursorCount
};
enum nsTopLevelWidgetZPlacement { // for PlaceBehind()
eZPlacementBottom = 0, // bottom of the window stack
eZPlacementBelow, // just below another widget
eZPlacementTop // top of the window stack
};
/**
* Before the OS goes to sleep, this topic is notified.
*/
#define NS_WIDGET_SLEEP_OBSERVER_TOPIC "sleep_notification"
/**
* After the OS wakes up, this topic is notified.
*/
#define NS_WIDGET_WAKE_OBSERVER_TOPIC "wake_notification"
/**
* Before the OS suspends the current process, this topic is notified. Some
* OS will kill processes that are suspended instead of resuming them.
* For that reason this topic may be useful to safely close down resources.
*/
#define NS_WIDGET_SUSPEND_PROCESS_OBSERVER_TOPIC "suspend_process_notification"
/**
* After the current process resumes from being suspended, this topic is
* notified.
*/
#define NS_WIDGET_RESUME_PROCESS_OBSERVER_TOPIC "resume_process_notification"
/**
* Preference for receiving IME updates
*
* If mWantUpdates is not NOTIFY_NOTHING, nsTextStateManager will observe text
* change and/or selection change and call nsIWidget::NotifyIMEOfTextChange()
* and/or nsIWidget::NotifyIME(NOTIFY_IME_OF_SELECTION_CHANGE).
* Please note that the text change observing cost is very expensive especially
* on an HTML editor has focus.
* If the IME implementation on a particular platform doesn't care about
* NotifyIMEOfTextChange() and/or NotifyIME(NOTIFY_IME_OF_SELECTION_CHANGE),
* they should set mWantUpdates to NOTIFY_NOTHING to avoid the cost.
*
* If mWantHints is true, PuppetWidget will forward the content of text fields
* to the chrome process to be cached. This way we return the cached content
* during query events. (see comments in bug 583976). This only makes sense
* for IME implementations that do use query events, otherwise there's a
* significant overhead. Platforms that don't use query events should set
* mWantHints to false.
*/
struct nsIMEUpdatePreference {
typedef int8_t Notifications;
enum
{
NOTIFY_NOTHING = 0x0000,
NOTIFY_SELECTION_CHANGE = 0x0001,
NOTIFY_TEXT_CHANGE = 0x0002
};
nsIMEUpdatePreference()
: mWantUpdates(NOTIFY_NOTHING), mWantHints(false)
{
}
nsIMEUpdatePreference(Notifications aWantUpdates, bool aWantHints)
: mWantUpdates(aWantUpdates), mWantHints(aWantHints)
{
}
Notifications mWantUpdates;
bool mWantHints;
};
/*
* Contains IMEStatus plus information about the current
* input context that the IME can use as hints if desired.
*/
namespace mozilla {
namespace widget {
struct IMEState {
/**
* IME enabled states, the mEnabled value of
* SetInputContext()/GetInputContext() should be one value of following
* values.
*
* WARNING: If you change these values, you also need to edit:
* nsIDOMWindowUtils.idl
* nsContentUtils::GetWidgetStatusFromIMEStatus
*/
enum Enabled {
/**
* 'Disabled' means the user cannot use IME. So, the IME open state should
* be 'closed' during 'disabled'.
*/
DISABLED,
/**
* 'Enabled' means the user can use IME.
*/
ENABLED,
/**
* 'Password' state is a special case for the password editors.
* E.g., on mac, the password editors should disable the non-Roman
* keyboard layouts at getting focus. Thus, the password editor may have
* special rules on some platforms.
*/
PASSWORD,
/**
* This state is used when a plugin is focused.
* When a plug-in is focused content, we should send native events
* directly. Because we don't process some native events, but they may
* be needed by the plug-in.
*/
PLUGIN
};
Enabled mEnabled;
/**
* IME open states the mOpen value of SetInputContext() should be one value of
* OPEN, CLOSE or DONT_CHANGE_OPEN_STATE. GetInputContext() should return
* OPEN, CLOSE or OPEN_STATE_NOT_SUPPORTED.
*/
enum Open {
/**
* 'Unsupported' means the platform cannot return actual IME open state.
* This value is used only by GetInputContext().
*/
OPEN_STATE_NOT_SUPPORTED,
/**
* 'Don't change' means the widget shouldn't change IME open state when
* SetInputContext() is called.
*/
DONT_CHANGE_OPEN_STATE = OPEN_STATE_NOT_SUPPORTED,
/**
* 'Open' means that IME should compose in its primary language (or latest
* input mode except direct ASCII character input mode). Even if IME is
* opened by this value, users should be able to close IME by theirselves.
* Web contents can specify this value by |ime-mode: active;|.
*/
OPEN,
/**
* 'Closed' means that IME shouldn't handle key events (or should handle
* as ASCII character inputs on mobile device). Even if IME is closed by
* this value, users should be able to open IME by theirselves.
* Web contents can specify this value by |ime-mode: inactive;|.
*/
CLOSED
};
Open mOpen;
IMEState() : mEnabled(ENABLED), mOpen(DONT_CHANGE_OPEN_STATE) { }
IMEState(Enabled aEnabled, Open aOpen = DONT_CHANGE_OPEN_STATE) :
mEnabled(aEnabled), mOpen(aOpen)
{
}
};
struct InputContext {
InputContext() : mNativeIMEContext(nullptr) {}
bool IsPasswordEditor() const
{
return mHTMLInputType.LowerCaseEqualsLiteral("password");
}
IMEState mIMEState;
/* The type of the input if the input is a html input field */
nsString mHTMLInputType;
/* The type of the inputmode */
nsString mHTMLInputInputmode;
/* A hint for the action that is performed when the input is submitted */
nsString mActionHint;
/* Native IME context for the widget. This doesn't come from the argument of
SetInputContext(). If there is only one context in the process, this may
be nullptr. */
void* mNativeIMEContext;
};
struct InputContextAction {
/**
* mCause indicates what action causes calling nsIWidget::SetInputContext().
* It must be one of following values.
*/
enum Cause {
// The cause is unknown but originated from content. Focus might have been
// changed by content script.
CAUSE_UNKNOWN,
// The cause is unknown but originated from chrome. Focus might have been
// changed by chrome script.
CAUSE_UNKNOWN_CHROME,
// The cause is user's keyboard operation.
CAUSE_KEY,
// The cause is user's mouse operation.
CAUSE_MOUSE
};
Cause mCause;
/**
* mFocusChange indicates what happened for focus.
*/
enum FocusChange {
FOCUS_NOT_CHANGED,
// A content got focus.
GOT_FOCUS,
// Focused content lost focus.
LOST_FOCUS,
// Menu got pseudo focus that means focused content isn't changed but
// keyboard events will be handled by menu.
MENU_GOT_PSEUDO_FOCUS,
// Menu lost pseudo focus that means focused content will handle keyboard
// events.
MENU_LOST_PSEUDO_FOCUS
};
FocusChange mFocusChange;
bool ContentGotFocusByTrustedCause() const {
return (mFocusChange == GOT_FOCUS &&
mCause != CAUSE_UNKNOWN);
}
bool UserMightRequestOpenVKB() const {
return (mFocusChange == FOCUS_NOT_CHANGED &&
mCause == CAUSE_MOUSE);
}
InputContextAction() :
mCause(CAUSE_UNKNOWN), mFocusChange(FOCUS_NOT_CHANGED)
{
}
InputContextAction(Cause aCause,
FocusChange aFocusChange = FOCUS_NOT_CHANGED) :
mCause(aCause), mFocusChange(aFocusChange)
{
}
};
/**
* Size constraints for setting the minimum and maximum size of a widget.
* Values are in device pixels.
*/
struct SizeConstraints {
SizeConstraints()
: mMaxSize(NS_MAXSIZE, NS_MAXSIZE)
{
}
SizeConstraints(nsIntSize aMinSize,
nsIntSize aMaxSize)
: mMinSize(aMinSize),
mMaxSize(aMaxSize)
{
}
nsIntSize mMinSize;
nsIntSize mMaxSize;
};
// NotificationToIME is shared by nsIMEStateManager and TextComposition.
enum NotificationToIME {
// XXX We should replace NOTIFY_IME_OF_CURSOR_POS_CHANGED with
// NOTIFY_IME_OF_SELECTION_CHANGE later.
NOTIFY_IME_OF_CURSOR_POS_CHANGED,
// An editable content is getting focus
NOTIFY_IME_OF_FOCUS,
// An editable content is losing focus
NOTIFY_IME_OF_BLUR,
// Selection in the focused editable content is changed
NOTIFY_IME_OF_SELECTION_CHANGE,
REQUEST_TO_COMMIT_COMPOSITION,
REQUEST_TO_CANCEL_COMPOSITION
};
} // namespace widget
} // namespace mozilla
/**
* The base class for all the widgets. It provides the interface for
* all basic and necessary functionality.
*/
class nsIWidget : public nsISupports {
protected:
typedef mozilla::dom::TabChild TabChild;
public:
typedef mozilla::layers::Composer2D Composer2D;
typedef mozilla::layers::CompositorChild CompositorChild;
typedef mozilla::layers::LayerManager LayerManager;
typedef mozilla::layers::LayersBackend LayersBackend;
typedef mozilla::layers::PLayerTransactionChild PLayerTransactionChild;
typedef mozilla::widget::NotificationToIME NotificationToIME;
typedef mozilla::widget::IMEState IMEState;
typedef mozilla::widget::InputContext InputContext;
typedef mozilla::widget::InputContextAction InputContextAction;
typedef mozilla::widget::SizeConstraints SizeConstraints;
// Used in UpdateThemeGeometries.
struct ThemeGeometry {
// The -moz-appearance value for the themed widget
uint8_t mWidgetType;
// The device-pixel rect within the window for the themed widget
nsIntRect mRect;
ThemeGeometry(uint8_t aWidgetType, const nsIntRect& aRect)
: mWidgetType(aWidgetType)
, mRect(aRect)
{ }
};
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IWIDGET_IID)
nsIWidget()
: mLastChild(nullptr)
, mPrevSibling(nullptr)
, mOnDestroyCalled(false)
{}
/**
* Create and initialize a widget.
*
* All the arguments can be NULL in which case a top level window
* with size 0 is created. The event callback function has to be
* provided only if the caller wants to deal with the events this
* widget receives. The event callback is basically a preprocess
* hook called synchronously. The return value determines whether
* the event goes to the default window procedure or it is hidden
* to the os. The assumption is that if the event handler returns
* false the widget does not see the event. The widget should not
* automatically clear the window to the background color. The
* calling code must handle paint messages and clear the background
* itself.
*
* In practice at least one of aParent and aNativeParent will be null. If
* both are null the widget isn't parented (e.g. context menus or
* independent top level windows).
*
* The dimensions given in aRect are specified in the parent's
* coordinate system, or for parentless widgets such as top-level
* windows, in global CSS pixels.
*
* @param aParent parent nsIWidget
* @param aNativeParent native parent widget
* @param aRect the widget dimension
* @param aContext
* @param aInitData data that is used for widget initialization
*
*/
NS_IMETHOD Create(nsIWidget *aParent,
nsNativeWidget aNativeParent,
const nsIntRect &aRect,
nsDeviceContext *aContext,
nsWidgetInitData *aInitData = nullptr) = 0;
/**
* Allocate, initialize, and return a widget that is a child of
* |this|. The returned widget (if nonnull) has gone through the
* equivalent of CreateInstance(widgetCID) + Create(...).
*
* |CreateChild()| lets widget backends decide whether to parent
* the new child widget to this, nonnatively parent it, or both.
* This interface exists to support the PuppetWidget backend,
* which is entirely non-native. All other params are the same as
* for |Create()|.
*
* |aForceUseIWidgetParent| forces |CreateChild()| to only use the
* |nsIWidget*| this, not its native widget (if it exists), when
* calling |Create()|. This is a timid hack around poorly
* understood code, and shouldn't be used in new code.
*/
virtual already_AddRefed<nsIWidget>
CreateChild(const nsIntRect &aRect,
nsDeviceContext *aContext,
nsWidgetInitData *aInitData = nullptr,
bool aForceUseIWidgetParent = false) = 0;
/**
* Attach to a top level widget.
*
* In cases where a top level chrome widget is being used as a content
* container, attach a secondary listener and update the device
* context. The primary widget listener will continue to be called for
* notifications relating to the top-level window, whereas other
* notifications such as painting and events will instead be called via
* the attached listener. SetAttachedWidgetListener should be used to
* assign the attached listener.
*
* aUseAttachedEvents if true, events are sent to the attached listener
* instead of the normal listener.
* aContext The new device context for the view
*/
NS_IMETHOD AttachViewToTopLevel(bool aUseAttachedEvents,
nsDeviceContext *aContext) = 0;
/**
* Accessor functions to get and set the attached listener. Used by
* nsView in connection with AttachViewToTopLevel above.
*/
virtual void SetAttachedWidgetListener(nsIWidgetListener* aListener) = 0;
virtual nsIWidgetListener* GetAttachedWidgetListener() = 0;
/**
* Accessor functions to get and set the listener which handles various
* actions for the widget.
*/
//@{
virtual nsIWidgetListener* GetWidgetListener() = 0;
virtual void SetWidgetListener(nsIWidgetListener* alistener) = 0;
//@}
/**
* Close and destroy the internal native window.
* This method does not delete the widget.
*/
NS_IMETHOD Destroy(void) = 0;
/**
* Destroyed() returns true if Destroy() has been called already.
* Otherwise, false.
*/
bool Destroyed() const { return mOnDestroyCalled; }
/**
* Reparent a widget
*
* Change the widget's parent. Null parents are allowed.
*
* @param aNewParent new parent
*/
NS_IMETHOD SetParent(nsIWidget* aNewParent) = 0;
NS_IMETHOD RegisterTouchWindow() = 0;
NS_IMETHOD UnregisterTouchWindow() = 0;
/**
* Return the parent Widget of this Widget or nullptr if this is a
* top level window
*
* @return the parent widget or nullptr if it does not have a parent
*
*/
virtual nsIWidget* GetParent(void) = 0;
/**
* Return the top level Widget of this Widget
*
* @return the top level widget
*/
virtual nsIWidget* GetTopLevelWidget() = 0;
/**
* Return the top (non-sheet) parent of this Widget if it's a sheet,
* or nullptr if this isn't a sheet (or some other error occurred).
* Sheets are only supported on some platforms (currently only OS X).
*
* @return the top (non-sheet) parent widget or nullptr
*
*/
virtual nsIWidget* GetSheetWindowParent(void) = 0;
/**
* Return the physical DPI of the screen containing the window ...
* the number of device pixels per inch.
*/
virtual float GetDPI() = 0;
/**
* Return the default scale factor for the window. This is the
* default number of device pixels per CSS pixel to use. This should
* depend on OS/platform settings such as the Mac's "UI scale factor"
* or Windows' "font DPI". This will take into account Gecko preferences
* overriding the system setting.
*/
mozilla::CSSToLayoutDeviceScale GetDefaultScale();
/**
* Return the Gecko override of the system default scale, if any;
* returns <= 0.0 if the system scale should be used as-is.
* nsIWidget::GetDefaultScale() [above] takes this into account.
* It is exposed here so that code that wants to check for a
* default-scale override without having a widget on hand can
* easily access the same value.
* Note that any scale override is a browser-wide value, whereas
* the default GetDefaultScale value (when no override is present)
* may vary between widgets (or screens).
*/
static double DefaultScaleOverride();
/**
* Return the first child of this widget. Will return null if
* there are no children.
*/
nsIWidget* GetFirstChild() const {
return mFirstChild;
}
/**
* Return the last child of this widget. Will return null if
* there are no children.
*/
nsIWidget* GetLastChild() const {
return mLastChild;
}
/**
* Return the next sibling of this widget
*/
nsIWidget* GetNextSibling() const {
return mNextSibling;
}
/**
* Set the next sibling of this widget
*/
void SetNextSibling(nsIWidget* aSibling) {
mNextSibling = aSibling;
}
/**
* Return the previous sibling of this widget
*/
nsIWidget* GetPrevSibling() const {
return mPrevSibling;
}
/**
* Set the previous sibling of this widget
*/
void SetPrevSibling(nsIWidget* aSibling) {
mPrevSibling = aSibling;
}
/**
* Show or hide this widget
*
* @param aState true to show the Widget, false to hide it
*
*/
NS_IMETHOD Show(bool aState) = 0;
/**
* Make the window modal
*
*/
NS_IMETHOD SetModal(bool aModal) = 0;
/**
* Returns whether the window is visible
*
*/
virtual bool IsVisible() const = 0;
/**
* Perform platform-dependent sanity check on a potential window position.
* This is guaranteed to work only for top-level windows.
*
* @param aAllowSlop: if true, allow the window to slop offscreen;
* the window should be partially visible. if false,
* force the entire window onscreen (or at least
* the upper-left corner, if it's too large).
* @param aX in: an x position expressed in screen coordinates.
* out: the x position constrained to fit on the screen(s).
* @param aY in: an y position expressed in screen coordinates.
* out: the y position constrained to fit on the screen(s).
* @return vapid success indication. but see also the parameters.
*
**/
NS_IMETHOD ConstrainPosition(bool aAllowSlop,
int32_t *aX,
int32_t *aY) = 0;
/**
* NOTE:
*
* For a top-level window widget, the "parent's coordinate system" is the
* "global" display pixel coordinate space, *not* device pixels (which
* may be inconsistent between multiple screens, at least in the Mac OS
* case with mixed hi-dpi and lo-dpi displays). This applies to all the
* following Move and Resize widget APIs.
*
* The display-/device-pixel distinction becomes important for (at least)
* Mac OS X with Hi-DPI (retina) displays, and Windows when the UI scale
* factor is set to other than 100%.
*
* The Move and Resize methods take floating-point parameters, rather than
* integer ones. This is important when manipulating top-level widgets,
* where the coordinate system may not be an integral multiple of the
* device-pixel space.
**/
/**
* Move this widget.
*
* Coordinates refer to the top-left of the widget. For toplevel windows
* with decorations, this is the top-left of the titlebar and frame .
*
* @param aX the new x position expressed in the parent's coordinate system
* @param aY the new y position expressed in the parent's coordinate system
*
**/
NS_IMETHOD Move(double aX, double aY) = 0;
/**
* Reposition this widget so that the client area has the given offset.
*
* @param aX the new x offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
* @param aY the new y offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
*
**/
NS_IMETHOD MoveClient(double aX, double aY) = 0;
/**
* Resize this widget. Any size constraints set for the window by a
* previous call to SetSizeConstraints will be applied.
*
* @param aWidth the new width expressed in the parent's coordinate system
* @param aHeight the new height expressed in the parent's coordinate system
* @param aRepaint whether the widget should be repainted
*
*/
NS_IMETHOD Resize(double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Move or resize this widget. Any size constraints set for the window by
* a previous call to SetSizeConstraints will be applied.
*
* @param aX the new x position expressed in the parent's coordinate system
* @param aY the new y position expressed in the parent's coordinate system
* @param aWidth the new width expressed in the parent's coordinate system
* @param aHeight the new height expressed in the parent's coordinate system
* @param aRepaint whether the widget should be repainted if the size changes
*
*/
NS_IMETHOD Resize(double aX,
double aY,
double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Resize the widget so that the inner client area has the given size.
*
* @param aWidth the new width of the client area.
* @param aHeight the new height of the client area.
* @param aRepaint whether the widget should be repainted
*
*/
NS_IMETHOD ResizeClient(double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Resize and reposition the widget so tht inner client area has the given
* offset and size.
*
* @param aX the new x offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
* @param aY the new y offset of the client area expressed as an
* offset from the origin of the client area of the parent
* widget (for root widgets and popup widgets it is in
* screen coordinates)
* @param aWidth the new width of the client area.
* @param aHeight the new height of the client area.
* @param aRepaint whether the widget should be repainted
*
*/
NS_IMETHOD ResizeClient(double aX,
double aY,
double aWidth,
double aHeight,
bool aRepaint) = 0;
/**
* Sets the widget's z-index.
*/
NS_IMETHOD SetZIndex(int32_t aZIndex) = 0;
/**
* Gets the widget's z-index.
*/
NS_IMETHOD GetZIndex(int32_t* aZIndex) = 0;
/**
* Position this widget just behind the given widget. (Used to
* control z-order for top-level widgets. Get/SetZIndex by contrast
* control z-order for child widgets of other widgets.)
* @param aPlacement top, bottom, or below a widget
* (if top or bottom, param aWidget is ignored)
* @param aWidget widget to place this widget behind
* (only if aPlacement is eZPlacementBelow).
* null is equivalent to aPlacement of eZPlacementTop
* @param aActivate true to activate the widget after placing it
*/
NS_IMETHOD PlaceBehind(nsTopLevelWidgetZPlacement aPlacement,
nsIWidget *aWidget, bool aActivate) = 0;
/**
* Minimize, maximize or normalize the window size.
* Takes a value from nsSizeMode (see nsIWidgetListener.h)
*/
NS_IMETHOD SetSizeMode(int32_t aMode) = 0;
/**
* Return size mode (minimized, maximized, normalized).
* Returns a value from nsSizeMode (see nsIWidgetListener.h)
*/
virtual int32_t SizeMode() = 0;
/**
* Enable or disable this Widget
*
* @param aState true to enable the Widget, false to disable it.
*
*/
NS_IMETHOD Enable(bool aState) = 0;
/**
* Ask whether the widget is enabled
*/
virtual bool IsEnabled() const = 0;
/**
* Request activation of this window or give focus to this widget.
*
* @param aRaise If true, this function requests activation of this
* widget's toplevel window.
* If false, the appropriate toplevel window (which in
* the case of popups may not be this widget's toplevel
* window) is already active.
*/
NS_IMETHOD SetFocus(bool aRaise = false) = 0;
/**
* Get this widget's outside dimensions relative to its parent widget. For
* popup widgets the returned rect is in screen coordinates and not
* relative to its parent widget.
*
* @param aRect On return it holds the x, y, width and height of
* this widget.
*/
NS_IMETHOD GetBounds(nsIntRect &aRect) = 0;
/**
* Get this widget's outside dimensions in global coordinates. This
* includes any title bar on the window.
*
* @param aRect On return it holds the x, y, width and height of
* this widget.
*/
NS_IMETHOD GetScreenBounds(nsIntRect &aRect) = 0;
/**
* Get this widget's client area bounds, if the window has a 3D border
* appearance this returns the area inside the border. The position is the
* position of the client area relative to the client area of the parent
* widget (for root widgets and popup widgets it is in screen coordinates).
*
* @param aRect On return it holds the x. y, width and height of
* the client area of this widget.
*/
NS_IMETHOD GetClientBounds(nsIntRect &aRect) = 0;
/**
* Get the non-client area dimensions of the window.
*
*/
NS_IMETHOD GetNonClientMargins(nsIntMargin &margins) = 0;
/**
* Sets the non-client area dimensions of the window. Pass -1 to restore
* the system default frame size for that border. Pass zero to remove
* a border, or pass a specific value adjust a border. Units are in
* pixels. (DPI dependent)
*
* Platform notes:
* Windows: shrinking top non-client height will remove application
* icon and window title text. Glass desktops will refuse to set
* dimensions between zero and size < system default.
*
*/
NS_IMETHOD SetNonClientMargins(nsIntMargin &margins) = 0;
/**
* Get the client offset from the window origin.
*
* @return the x and y of the offset.
*
*/
virtual nsIntPoint GetClientOffset() = 0;
/**
* Get the foreground color for this widget
*
* @return this widget's foreground color
*
*/
virtual nscolor GetForegroundColor(void) = 0;
/**
* Set the foreground color for this widget
*
* @param aColor the new foreground color
*
*/
NS_IMETHOD SetForegroundColor(const nscolor &aColor) = 0;
/**
* Get the background color for this widget
*
* @return this widget's background color
*
*/
virtual nscolor GetBackgroundColor(void) = 0;
/**
* Set the background color for this widget
*
* @param aColor the new background color
*
*/
NS_IMETHOD SetBackgroundColor(const nscolor &aColor) = 0;
/**
* Get the cursor for this widget.
*
* @return this widget's cursor.
*/
virtual nsCursor GetCursor(void) = 0;
/**
* Set the cursor for this widget
*
* @param aCursor the new cursor for this widget
*/
NS_IMETHOD SetCursor(nsCursor aCursor) = 0;
/**
* Sets an image as the cursor for this widget.
*
* @param aCursor the cursor to set
* @param aX the X coordinate of the hotspot (from left).
* @param aY the Y coordinate of the hotspot (from top).
* @retval NS_ERROR_NOT_IMPLEMENTED if setting images as cursors is not
* supported
*/
NS_IMETHOD SetCursor(imgIContainer* aCursor,
uint32_t aHotspotX, uint32_t aHotspotY) = 0;
/**
* Get the window type of this widget
*
* @param aWindowType the window type of the widget
*/
NS_IMETHOD GetWindowType(nsWindowType& aWindowType) = 0;
/**
* Set the transparency mode of the top-level window containing this widget.
* So, e.g., if you call this on the widget for an IFRAME, the top level
* browser window containing the IFRAME actually gets set. Be careful.
*
* This can fail if the platform doesn't support
* transparency/glass. By default widgets are not
* transparent. This will also fail if the toplevel window is not
* a Mozilla window, e.g., if the widget is in an embedded
* context.
*
* After transparency/glass has been enabled, the initial alpha channel
* value for all pixels is 1, i.e., opaque.
* If the window is resized then the alpha channel values for
* all pixels are reset to 1.
* Pixel RGB color values are already premultiplied with alpha channel values.
*/
virtual void SetTransparencyMode(nsTransparencyMode aMode) = 0;
/**
* Get the transparency mode of the top-level window that contains this
* widget.
*/
virtual nsTransparencyMode GetTransparencyMode() = 0;
/**
* This represents a command to set the bounds and clip region of
* a child widget.
*/
struct Configuration {
nsIWidget* mChild;
nsIntRect mBounds;
nsTArray<nsIntRect> mClipRegion;
};
/**
* Sets the clip region of each mChild (which must actually be a child
* of this widget) to the union of the pixel rects given in
* mClipRegion, all relative to the top-left of the child
* widget. Clip regions are not implemented on all platforms and only
* need to actually work for children that are plugins.
*
* Also sets the bounds of each child to mBounds.
*
* This will invalidate areas of the children that have changed, but
* does not need to invalidate any part of this widget.
*
* Children should be moved in the order given; the array is
* sorted so to minimize unnecessary invalidation if children are
* moved in that order.
*/
virtual nsresult ConfigureChildren(const nsTArray<Configuration>& aConfigurations) = 0;
/**
* Appends to aRects the rectangles constituting this widget's clip
* region. If this widget is not clipped, appends a single rectangle
* (0, 0, bounds.width, bounds.height).
*/
virtual void GetWindowClipRegion(nsTArray<nsIntRect>* aRects) = 0;
/**
* Set the shadow style of the window.
*
* Ignored on child widgets and on non-Mac platforms.
*/
NS_IMETHOD SetWindowShadowStyle(int32_t aStyle) = 0;
/*
* On Mac OS X, this method shows or hides the pill button in the titlebar
* that's used to collapse the toolbar.
*
* Ignored on child widgets and on non-Mac platforms.
*/
virtual void SetShowsToolbarButton(bool aShow) = 0;
/*
* On Mac OS X Lion, this method shows or hides the full screen button in
* the titlebar that handles native full screen mode.
*
* Ignored on child widgets, non-Mac platforms, & pre-Lion Mac.
*/
virtual void SetShowsFullScreenButton(bool aShow) = 0;
enum WindowAnimationType {
eGenericWindowAnimation,
eDocumentWindowAnimation
};
/**
* Sets the kind of top-level window animation this widget should have. On
* Mac OS X, this causes a particular kind of animation to be shown when the
* window is first made visible.
*
* Ignored on child widgets and on non-Mac platforms.
*/
virtual void SetWindowAnimationType(WindowAnimationType aType) = 0;
/**
* Hide window chrome (borders, buttons) for this widget.
*
*/
NS_IMETHOD HideWindowChrome(bool aShouldHide) = 0;
/**
* Put the toplevel window into or out of fullscreen mode.
*
*/
NS_IMETHOD MakeFullScreen(bool aFullScreen) = 0;
/**
* Invalidate a specified rect for a widget so that it will be repainted
* later.
*/
NS_IMETHOD Invalidate(const nsIntRect & aRect) = 0;
enum LayerManagerPersistence
{
LAYER_MANAGER_CURRENT = 0,
LAYER_MANAGER_PERSISTENT
};
/**
* Return the widget's LayerManager. The layer tree for that
* LayerManager is what gets rendered to the widget.
*
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
inline LayerManager* GetLayerManager(bool* aAllowRetaining = nullptr)
{
return GetLayerManager(nullptr, mozilla::layers::LAYERS_NONE,
LAYER_MANAGER_CURRENT, aAllowRetaining);
}
inline LayerManager* GetLayerManager(LayerManagerPersistence aPersistence,
bool* aAllowRetaining = nullptr)
{
return GetLayerManager(nullptr, mozilla::layers::LAYERS_NONE,
aPersistence, aAllowRetaining);
}
/**
* Like GetLayerManager(), but prefers creating a layer manager of
* type |aBackendHint| instead of what would normally be created.
* LAYERS_NONE means "no hint".
*/
virtual LayerManager* GetLayerManager(PLayerTransactionChild* aShadowManager,
LayersBackend aBackendHint,
LayerManagerPersistence aPersistence = LAYER_MANAGER_CURRENT,
bool* aAllowRetaining = nullptr) = 0;
/**
* Called before each layer manager transaction to allow any preparation
* for DrawWindowUnderlay/Overlay that needs to be on the main thread.
*
* Always called on the main thread.
*/
virtual void PrepareWindowEffects() = 0;
/**
* Called when shutting down the LayerManager to clean-up any cached resources.
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual void CleanupWindowEffects() = 0;
/**
* Called before rendering using OpenGL. Returns false when the widget is
* not ready to be rendered (for example while the window is closed).
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual bool PreRender(LayerManager* aManager) = 0;
/**
* Called after rendering using OpenGL. Not called when rendering was
* cancelled by a negative return value from PreRender.
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual void PostRender(LayerManager* aManager) = 0;
/**
* Called before the LayerManager draws the layer tree.
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual void DrawWindowUnderlay(LayerManager* aManager, nsIntRect aRect) = 0;
/**
* Called after the LayerManager draws the layer tree
*
* Always called from the compositing thread, which may be the main-thread if
* OMTC is not enabled.
*/
virtual void DrawWindowOverlay(LayerManager* aManager, nsIntRect aRect) = 0;
/**
* Return a DrawTarget for the window which can be composited into.
*
* Called by BasicCompositor on the compositor thread for OMTC drawing
* before each composition.
*/
virtual mozilla::TemporaryRef<mozilla::gfx::DrawTarget> StartRemoteDrawing() = 0;
/**
* Ensure that what was painted into the DrawTarget returned from
* StartRemoteDrawing reaches the screen.
*
* Called by BasicCompositor on the compositor thread for OMTC drawing
* after each composition.
*/
virtual void EndRemoteDrawing() = 0;
/**
* Clean up any resources used by Start/EndRemoteDrawing.
*
* Called by BasicCompositor on the compositor thread for OMTC drawing
* when the compositor is destroyed.
*/
virtual void CleanupRemoteDrawing() = 0;
/**
* Called when Gecko knows which themed widgets exist in this window.
* The passed array contains an entry for every themed widget of the right
* type (currently only NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR and
* NS_THEME_TOOLBAR) within the window, except for themed widgets which are
* transformed or have effects applied to them (e.g. CSS opacity or
* filters).
* This could sometimes be called during display list construction
* outside of painting.
* If called during painting, it will be called before we actually
* paint anything.
*/
virtual void UpdateThemeGeometries(const nsTArray<ThemeGeometry>& aThemeGeometries) = 0;
/**
* Informs the widget about the region of the window that is opaque.
*
* @param aOpaqueRegion the region of the window that is opaque.
*/
virtual void UpdateOpaqueRegion(const nsIntRegion &aOpaqueRegion) {}
/**
* Internal methods
*/
//@{
virtual void AddChild(nsIWidget* aChild) = 0;
virtual void RemoveChild(nsIWidget* aChild) = 0;
virtual void* GetNativeData(uint32_t aDataType) = 0;
virtual void FreeNativeData(void * data, uint32_t aDataType) = 0;//~~~
// GetDeviceContext returns a weak pointer to this widget's device context
virtual nsDeviceContext* GetDeviceContext() = 0;
//@}
/**
* Set the widget's title.
* Must be called after Create.
*
* @param aTitle string displayed as the title of the widget
*/
NS_IMETHOD SetTitle(const nsAString& aTitle) = 0;
/**
* Set the widget's icon.
* Must be called after Create.
*
* @param anIconSpec string specifying the icon to use; convention is to pass
* a resource: URL from which a platform-dependent resource
* file name will be constructed
*/
NS_IMETHOD SetIcon(const nsAString& anIconSpec) = 0;
/**
* Return this widget's origin in screen coordinates.
*
* @return screen coordinates stored in the x,y members
*/
virtual nsIntPoint WidgetToScreenOffset() = 0;
/**
* Given the specified client size, return the corresponding window size,
* which includes the area for the borders and titlebar. This method
* should work even when the window is not yet visible.
*/
virtual nsIntSize ClientToWindowSize(const nsIntSize& aClientSize) = 0;
/**
* Dispatches an event to the widget
*
*/
NS_IMETHOD DispatchEvent(mozilla::WidgetGUIEvent* event,
nsEventStatus & aStatus) = 0;
/**
* Enables the dropping of files to a widget (XXX this is temporary)
*
*/
NS_IMETHOD EnableDragDrop(bool aEnable) = 0;
/**
* Enables/Disables system mouse capture.
* @param aCapture true enables mouse capture, false disables mouse capture
*
*/
NS_IMETHOD CaptureMouse(bool aCapture) = 0;
/**
* Classify the window for the window manager. Mostly for X11.
*/
NS_IMETHOD SetWindowClass(const nsAString& xulWinType) = 0;
/**
* Enables/Disables system capture of any and all events that would cause a
* popup to be rolled up. aListener should be set to a non-null value for
* any popups that are not managed by the popup manager.
* @param aDoCapture true enables capture, false disables capture
*
*/
NS_IMETHOD CaptureRollupEvents(nsIRollupListener* aListener, bool aDoCapture) = 0;
/**
* Bring this window to the user's attention. This is intended to be a more
* gentle notification than popping the window to the top or putting up an
* alert. See, for example, Win32 FlashWindow or the NotificationManager on
* the Mac. The notification should be suppressed if the window is already
* in the foreground and should be dismissed when the user brings this window
* to the foreground.
* @param aCycleCount Maximum number of times to animate the window per system
* conventions. If set to -1, cycles indefinitely until
* window is brought into the foreground.
*/
NS_IMETHOD GetAttention(int32_t aCycleCount) = 0;
/**
* Ask whether there user input events pending. All input events are
* included, including those not targeted at this nsIwidget instance.
*/
virtual bool HasPendingInputEvent() = 0;
/**
* Set the background color of the window titlebar for this widget. On Mac,
* for example, this will remove the grey gradient and bottom border and
* instead show a single, solid color.
*
* Ignored on any platform that does not support it. Ignored by widgets that
* do not represent windows.
*
* @param aColor The color to set the title bar background to. Alpha values
* other than fully transparent (0) are respected if possible
* on the platform. An alpha of 0 will cause the window to
* draw with the default style for the platform.
*
* @param aActive Whether the color should be applied to active or inactive
* windows.
*/
NS_IMETHOD SetWindowTitlebarColor(nscolor aColor, bool aActive) = 0;
/**
* If set to true, the window will draw its contents into the titlebar
* instead of below it.
*
* Ignored on any platform that does not support it. Ignored by widgets that
* do not represent windows.
* May result in a resize event, so should only be called from places where
* reflow and painting is allowed.
*
* @param aState Whether drawing into the titlebar should be activated.
*/
virtual void SetDrawsInTitlebar(bool aState) = 0;
/*
* Determine whether the widget shows a resize widget. If it does,
* aResizerRect returns the resizer's rect.
*
* Returns false on any platform that does not support it.
*
* @param aResizerRect The resizer's rect in device pixels.
* @return Whether a resize widget is shown.
*/
virtual bool ShowsResizeIndicator(nsIntRect* aResizerRect) = 0;
/**
* Get the Thebes surface associated with this widget.
*/
virtual gfxASurface *GetThebesSurface() = 0;
/**
* Return the popup that was last rolled up, or null if there isn't one.
*/
virtual nsIContent* GetLastRollup() = 0;
/**
* Begin a window resizing drag, based on the event passed in.
*/
NS_IMETHOD BeginResizeDrag(mozilla::WidgetGUIEvent* aEvent,
int32_t aHorizontal,
int32_t aVertical) = 0;
/**
* Begin a window moving drag, based on the event passed in.
*/
NS_IMETHOD BeginMoveDrag(mozilla::WidgetMouseEvent* aEvent) = 0;
enum Modifiers {
CAPS_LOCK = 0x01, // when CapsLock is active
NUM_LOCK = 0x02, // when NumLock is active
SHIFT_L = 0x0100,
SHIFT_R = 0x0200,
CTRL_L = 0x0400,
CTRL_R = 0x0800,
ALT_L = 0x1000, // includes Option
ALT_R = 0x2000,
COMMAND_L = 0x4000,
COMMAND_R = 0x8000,
HELP = 0x10000,
FUNCTION = 0x100000,
NUMERIC_KEY_PAD = 0x01000000 // when the key is coming from the keypad
};
/**
* Utility method intended for testing. Dispatches native key events
* to this widget to simulate the press and release of a key.
* @param aNativeKeyboardLayout a *platform-specific* constant.
* On Mac, this is the resource ID for a 'uchr' or 'kchr' resource.
* On Windows, it is converted to a hex string and passed to
* LoadKeyboardLayout, see
* http://msdn.microsoft.com/en-us/library/ms646305(VS.85).aspx
* @param aNativeKeyCode a *platform-specific* keycode.
* On Windows, this is the virtual key code.
* @param aModifiers some combination of the above 'Modifiers' flags;
* not all flags will apply to all platforms. Mac ignores the _R
* modifiers. Windows ignores COMMAND, NUMERIC_KEY_PAD, HELP and
* FUNCTION.
* @param aCharacters characters that the OS would decide to generate
* from the event. On Windows, this is the charCode passed by
* WM_CHAR.
* @param aUnmodifiedCharacters characters that the OS would decide
* to generate from the event if modifier keys (other than shift)
* were assumed inactive. Needed on Mac, ignored on Windows.
* @return NS_ERROR_NOT_AVAILABLE to indicate that the keyboard
* layout is not supported and the event was not fired
*/
virtual nsresult SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
int32_t aNativeKeyCode,
uint32_t aModifierFlags,
const nsAString& aCharacters,
const nsAString& aUnmodifiedCharacters) = 0;
/**
* Utility method intended for testing. Dispatches native mouse events
* may even move the mouse cursor. On Mac the events are guaranteed to
* be sent to the window containing this widget, but on Windows they'll go
* to whatever's topmost on the screen at that position, so for
* cross-platform testing ensure that your window is at the top of the
* z-order.
* @param aPoint screen location of the mouse, in device
* pixels, with origin at the top left
* @param aNativeMessage *platform-specific* event type (e.g. on Mac,
* NSMouseMoved; on Windows, MOUSEEVENTF_MOVE, MOUSEEVENTF_LEFTDOWN etc)
* @param aModifierFlags *platform-specific* modifier flags (ignored
* on Windows)
*/
virtual nsresult SynthesizeNativeMouseEvent(nsIntPoint aPoint,
uint32_t aNativeMessage,
uint32_t aModifierFlags) = 0;
/**
* A shortcut to SynthesizeNativeMouseEvent, abstracting away the native message.
* aPoint is location in device pixels to which the mouse pointer moves to.
*/
virtual nsresult SynthesizeNativeMouseMove(nsIntPoint aPoint) = 0;
/**
* Utility method intended for testing. Dispatching native mouse scroll
* events may move the mouse cursor.
*
* @param aPoint Mouse cursor position in screen coordinates.
* In device pixels, the origin at the top left of
* the primary display.
* @param aNativeMessage Platform native message.
* @param aDeltaX The delta value for X direction. If the native
* message doesn't indicate X direction scrolling,
* this may be ignored.
* @param aDeltaY The delta value for Y direction. If the native
* message doesn't indicate Y direction scrolling,
* this may be ignored.
* @param aDeltaZ The delta value for Z direction. If the native
* message doesn't indicate Z direction scrolling,
* this may be ignored.
* @param aModifierFlags Must be values of Modifiers, or zero.
* @param aAdditionalFlags See nsIDOMWidnowUtils' consts and their
* document.
*/
virtual nsresult SynthesizeNativeMouseScrollEvent(nsIntPoint aPoint,
uint32_t aNativeMessage,
double aDeltaX,
double aDeltaY,
double aDeltaZ,
uint32_t aModifierFlags,
uint32_t aAdditionalFlags) = 0;
/**
* Activates a native menu item at the position specified by the index
* string. The index string is a string of positive integers separated
* by the "|" (pipe) character. The last integer in the string represents
* the item index in a submenu located using the integers preceding it.
*
* Example: 1|0|4
* In this string, the first integer represents the top-level submenu
* in the native menu bar. Since the integer is 1, it is the second submeu
* in the native menu bar. Within that, the first item (index 0) is a
* submenu, and we want to activate the 5th item within that submenu.
*/
virtual nsresult ActivateNativeMenuItemAt(const nsAString& indexString) = 0;
/**
* This is used for native menu system testing.
*
* Updates a native menu at the position specified by the index string.
* The index string is a string of positive integers separated by the "|"
* (pipe) character.
*
* Example: 1|0|4
* In this string, the first integer represents the top-level submenu
* in the native menu bar. Since the integer is 1, it is the second submeu
* in the native menu bar. Within that, the first item (index 0) is a
* submenu, and we want to update submenu at index 4 within that submenu.
*
* If this is called with an empty string it forces a full reload of the
* menu system.
*/
virtual nsresult ForceUpdateNativeMenuAt(const nsAString& indexString) = 0;
/**
* Notify IME of the specified notification.
*/
NS_IMETHOD NotifyIME(NotificationToIME aNotification) = 0;
/*
* Notifies the input context changes.
*/
NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
const InputContextAction& aAction) = 0;
/*
* Get current input context.
*/
NS_IMETHOD_(InputContext) GetInputContext() = 0;
/**
* Set layers acceleration to 'True' or 'False'
*/
NS_IMETHOD SetLayersAcceleration(bool aEnabled) = 0;
/*
* Get toggled key states.
* aKeyCode should be NS_VK_CAPS_LOCK or NS_VK_NUM_LOCK or
* NS_VK_SCROLL_LOCK.
* aLEDState is the result for current LED state of the key.
* If the LED is 'ON', it returns TRUE, otherwise, FALSE.
* If the platform doesn't support the LED state (or we cannot get the
* state), this method returns NS_ERROR_NOT_IMPLEMENTED.
*/
NS_IMETHOD GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState) = 0;
/*
* Text content of the focused node has changed
* aStart is the starting offset of the change
* aOldEnd is the ending offset of the change
* aNewEnd is the caret offset after the change
*/
NS_IMETHOD NotifyIMEOfTextChange(uint32_t aStart,
uint32_t aOldEnd,
uint32_t aNewEnd) = 0;
/*
* Retrieves preference for IME updates
*/
virtual nsIMEUpdatePreference GetIMEUpdatePreference() = 0;
/*
* Call this method when a dialog is opened which has a default button.
* The button's rectangle should be supplied in aButtonRect.
*/
NS_IMETHOD OnDefaultButtonLoaded(const nsIntRect &aButtonRect) = 0;
/**
* Compute the overridden system mouse scroll speed on the root content of
* web pages. The widget may set the same value as aOriginalDelta. E.g.,
* when the system scrolling settings were customized, widget can respect
* the will of the user.
*
* This is called only when the mouse wheel event scrolls the root content
* of the web pages by line. In other words, this isn't called when the
* mouse wheel event is used for zoom, page scroll and other special
* actions. And also this isn't called when the user doesn't use the
* system wheel speed settings.
*
* @param aOriginalDeltaX The X delta value of the current mouse wheel
* scrolling event.
* @param aOriginalDeltaX The Y delta value of the current mouse wheel
* scrolling event.
* @param aOverriddenDeltaX The overridden mouse scrolling speed along X
* axis. This value may be same as aOriginalDeltaX.
* @param aOverriddenDeltaY The overridden mouse scrolling speed along Y
* axis. This value may be same as aOriginalDeltaY.
*/
NS_IMETHOD OverrideSystemMouseScrollSpeed(double aOriginalDeltaX,
double aOriginalDeltaY,
double& aOverriddenDeltaX,
double& aOverriddenDeltaY) = 0;
/**
* Return true if this process shouldn't use platform widgets, and
* so should use PuppetWidgets instead. If this returns true, the
* result of creating and using a platform widget is undefined,
* and likely to end in crashes or other buggy behavior.
*/
static bool
UsePuppetWidgets()
{
return XRE_GetProcessType() == GeckoProcessType_Content;
}
/**
* Allocate and return a "puppet widget" that doesn't directly
* correlate to a platform widget; platform events and data must
* be fed to it. Currently used in content processes. NULL is
* returned if puppet widgets aren't supported in this build
* config, on this platform, or for this process type.
*
* This function is called "Create" to match CreateInstance().
* The returned widget must still be nsIWidget::Create()d.
*/
static already_AddRefed<nsIWidget>
CreatePuppetWidget(TabChild* aTabChild);
/**
* Reparent this widget's native widget.
* @param aNewParent the native widget of aNewParent is the new native
* parent widget
*/
NS_IMETHOD ReparentNativeWidget(nsIWidget* aNewParent) = 0;
/**
* Return the internal format of the default framebuffer for this
* widget.
*/
virtual uint32_t GetGLFrameBufferFormat() { return 0; /*GL_NONE*/ }
/**
* Return true if widget has it's own GL context
*/
virtual bool HasGLContext() { return false; }
/**
* Returns true to indicate that this widget paints an opaque background
* that we want to be visible under the page, so layout should not force
* a default background.
*/
virtual bool WidgetPaintsBackground() { return false; }
virtual bool NeedsPaint() {
if (!IsVisible()) {
return false;
}
nsIntRect bounds;
nsresult rv = GetBounds(bounds);
NS_ENSURE_SUCCESS(rv, false);
return !bounds.IsEmpty();
}
/**
* Get the natural bounds of this widget. This method is only
* meaningful for widgets for which Gecko implements screen
* rotation natively. When this is the case, GetBounds() returns
* the widget bounds taking rotation into account, and
* GetNaturalBounds() returns the bounds *not* taking rotation
* into account.
*
* No code outside of the composition pipeline should know or care
* about this. If you're not an agent of the compositor, you
* probably shouldn't call this method.
*/
virtual nsIntRect GetNaturalBounds() {
nsIntRect bounds;
GetBounds(bounds);
return bounds;
}
/**
* Set size constraints on the window size such that it is never less than
* the specified minimum size and never larger than the specified maximum
* size. The size constraints are sizes of the outer rectangle including
* the window frame and title bar. Use 0 for an unconstrained minimum size
* and NS_MAXSIZE for an unconstrained maximum size. Note that this method
* does not necessarily change the size of a window to conform to this size,
* thus Resize should be called afterwards.
*
* @param aConstraints: the size constraints in device pixels
*/
virtual void SetSizeConstraints(const SizeConstraints& aConstraints) = 0;
/**
* Return the size constraints currently observed by the widget.
*
* @return the constraints in device pixels
*/
virtual const SizeConstraints& GetSizeConstraints() const = 0;
/**
* If this is owned by a TabChild, return that. Otherwise return
* null.
*/
virtual TabChild* GetOwningTabChild() { return nullptr; }
/**
* If this isn't directly compositing to its window surface,
* return the compositor which is doing that on our behalf.
*/
virtual CompositorChild* GetRemoteRenderer()
{ return nullptr; }
/**
* If this widget has a more efficient composer available for its
* native framebuffer, return it.
*
* This can be called from a non-main thread, but that thread must
* hold a strong reference to this.
*/
virtual Composer2D* GetComposer2D()
{ return nullptr; }
/**
* Some platforms (only cocoa right now) round widget coordinates to the
* nearest even pixels (see bug 892994), this function allows us to
* determine how widget coordinates will be rounded.
*/
virtual int32_t RoundsWidgetCoordinatesTo() { return 1; }
protected:
/**
* Like GetDefaultScale, but taking into account only the system settings
* and ignoring Gecko preferences.
*/
virtual double GetDefaultScaleInternal() { return 1.0; }
// keep the list of children. We also keep track of our siblings.
// The ownership model is as follows: parent holds a strong ref to
// the first element of the list, and each element holds a strong
// ref to the next element in the list. The prevsibling and
// lastchild pointers are weak, which is fine as long as they are
// maintained properly.
nsCOMPtr<nsIWidget> mFirstChild;
nsIWidget* mLastChild;
nsCOMPtr<nsIWidget> mNextSibling;
nsIWidget* mPrevSibling;
// When Destroy() is called, the sub class should set this true.
bool mOnDestroyCalled;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIWidget, NS_IWIDGET_IID)
#endif // nsIWidget_h__
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