gecko/layout/forms/nsTextControlFrame.h
2011-10-17 10:59:28 -04:00

444 lines
15 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
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*
* ***** END LICENSE BLOCK ***** */
#ifndef nsTextControlFrame_h___
#define nsTextControlFrame_h___
#include "nsStackFrame.h"
#include "nsBlockFrame.h"
#include "nsIFormControlFrame.h"
#include "nsIAnonymousContentCreator.h"
#include "nsITextControlFrame.h"
#include "nsDisplayList.h"
#include "nsIScrollableFrame.h"
#include "nsStubMutationObserver.h"
#include "nsITextControlElement.h"
#include "nsIStatefulFrame.h"
#include "nsContentUtils.h" // nsAutoScriptBlocker
class nsIEditor;
class nsISelectionController;
class nsIDOMCharacterData;
#ifdef ACCESSIBILITY
class nsIAccessible;
#endif
class EditorInitializerEntryTracker;
class nsTextEditorState;
class nsTextControlFrame : public nsStackFrame,
public nsIAnonymousContentCreator,
public nsITextControlFrame,
public nsIStatefulFrame
{
public:
NS_DECL_FRAMEARENA_HELPERS
NS_DECLARE_FRAME_PROPERTY(ContentScrollPos, DestroyPoint)
nsTextControlFrame(nsIPresShell* aShell, nsStyleContext* aContext);
virtual ~nsTextControlFrame();
virtual void DestroyFrom(nsIFrame* aDestructRoot);
virtual nsIScrollableFrame* GetScrollTargetFrame() {
if (!IsScrollable())
return nsnull;
return do_QueryFrame(GetFirstPrincipalChild());
}
virtual nscoord GetMinWidth(nsRenderingContext* aRenderingContext);
virtual nsSize ComputeAutoSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder,
nsSize aPadding, bool aShrinkWrap);
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState);
virtual nsSize GetMinSize(nsBoxLayoutState& aBoxLayoutState);
virtual nsSize GetMaxSize(nsBoxLayoutState& aBoxLayoutState);
virtual nscoord GetBoxAscent(nsBoxLayoutState& aBoxLayoutState);
virtual bool IsCollapsed(nsBoxLayoutState& aBoxLayoutState);
DECL_DO_GLOBAL_REFLOW_COUNT_DSP(nsTextControlFrame, nsStackFrame)
virtual bool IsLeaf() const;
#ifdef ACCESSIBILITY
virtual already_AddRefed<nsAccessible> CreateAccessible();
#endif
#ifdef NS_DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const
{
aResult.AssignLiteral("nsTextControlFrame");
return NS_OK;
}
#endif
virtual bool IsFrameOfType(PRUint32 aFlags) const
{
// nsStackFrame is already both of these, but that's somewhat bogus,
// and we really mean it.
return nsStackFrame::IsFrameOfType(aFlags &
~(nsIFrame::eReplaced | nsIFrame::eReplacedContainsBlock));
}
// nsIAnonymousContentCreator
virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
PRUint32 aFilter);
// Utility methods to set current widget state
NS_IMETHOD SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList);
//==== BEGIN NSIFORMCONTROLFRAME
virtual void SetFocus(bool aOn , bool aRepaint);
virtual nsresult SetFormProperty(nsIAtom* aName, const nsAString& aValue);
virtual nsresult GetFormProperty(nsIAtom* aName, nsAString& aValue) const;
//==== END NSIFORMCONTROLFRAME
//==== NSITEXTCONTROLFRAME
NS_IMETHOD GetEditor(nsIEditor **aEditor);
NS_IMETHOD GetTextLength(PRInt32* aTextLength);
NS_IMETHOD CheckFireOnChange();
NS_IMETHOD SetSelectionStart(PRInt32 aSelectionStart);
NS_IMETHOD SetSelectionEnd(PRInt32 aSelectionEnd);
NS_IMETHOD SetSelectionRange(PRInt32 aSelectionStart,
PRInt32 aSelectionEnd,
SelectionDirection aDirection = eNone);
NS_IMETHOD GetSelectionRange(PRInt32* aSelectionStart,
PRInt32* aSelectionEnd,
SelectionDirection* aDirection = nsnull);
NS_IMETHOD GetOwnedSelectionController(nsISelectionController** aSelCon);
virtual nsFrameSelection* GetOwnedFrameSelection();
nsresult GetPhonetic(nsAString& aPhonetic);
/**
* Ensure mEditor is initialized with the proper flags and the default value.
* @throws NS_ERROR_NOT_INITIALIZED if mEditor has not been created
* @throws various and sundry other things
*/
virtual nsresult EnsureEditorInitialized();
//==== END NSITEXTCONTROLFRAME
//==== NSISTATEFULFRAME
NS_IMETHOD SaveState(SpecialStateID aStateID, nsPresState** aState);
NS_IMETHOD RestoreState(nsPresState* aState);
//=== END NSISTATEFULFRAME
//==== OVERLOAD of nsIFrame
virtual nsIAtom* GetType() const;
/** handler for attribute changes to mContent */
NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
nsresult GetText(nsString& aText);
NS_DECL_QUERYFRAME
// Temp reference to scriptrunner
// We could make these auto-Revoking via the "delete" entry for safety
NS_DECLARE_FRAME_PROPERTY(TextControlInitializer, nsnull)
public: //for methods who access nsTextControlFrame directly
void FireOnInput(bool aTrusted);
void SetValueChanged(bool aValueChanged);
/** Called when the frame is focused, to remember the value for onChange. */
nsresult InitFocusedValue();
void SetFireChangeEventState(bool aNewState)
{
mFireChangeEventState = aNewState;
}
bool GetFireChangeEventState() const
{
return mFireChangeEventState;
}
// called by the focus listener
nsresult MaybeBeginSecureKeyboardInput();
void MaybeEndSecureKeyboardInput();
class ValueSetter {
public:
ValueSetter(nsTextControlFrame* aFrame,
bool aHasFocusValue)
: mFrame(aFrame)
// This method isn't used for user-generated changes, except for calls
// from nsFileControlFrame which sets mFireChangeEventState==true and
// restores it afterwards (ie. we want 'change' events for those changes).
// Focused value must be updated to prevent incorrect 'change' events,
// but only if user hasn't changed the value.
, mFocusValueInit(!mFrame->mFireChangeEventState && aHasFocusValue)
, mOuterTransaction(false)
, mInited(false)
{
NS_ASSERTION(aFrame, "Should pass a valid frame");
}
void Cancel() {
mInited = false;
}
void Init() {
// Since this code does not handle user-generated changes to the text,
// make sure we don't fire oninput when the editor notifies us.
// (mNotifyOnInput must be reset before we return).
// To protect against a reentrant call to SetValue, we check whether
// another SetValue is already happening for this frame. If it is,
// we must wait until we unwind to re-enable oninput events.
mOuterTransaction = mFrame->mNotifyOnInput;
if (mOuterTransaction)
mFrame->mNotifyOnInput = false;
mInited = true;
}
~ValueSetter() {
if (!mInited)
return;
if (mOuterTransaction)
mFrame->mNotifyOnInput = true;
if (mFocusValueInit) {
// Reset mFocusedValue so the onchange event doesn't fire incorrectly.
mFrame->InitFocusedValue();
}
}
private:
nsTextControlFrame* mFrame;
bool mFocusValueInit;
bool mOuterTransaction;
bool mInited;
};
friend class ValueSetter;
#define DEFINE_TEXTCTRL_FORWARDER(type, name) \
type name() { \
nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent()); \
NS_ASSERTION(txtCtrl, "Content not a text control element"); \
return txtCtrl->name(); \
}
#define DEFINE_TEXTCTRL_CONST_FORWARDER(type, name) \
type name() const { \
nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent()); \
NS_ASSERTION(txtCtrl, "Content not a text control element"); \
return txtCtrl->name(); \
}
DEFINE_TEXTCTRL_CONST_FORWARDER(bool, IsSingleLineTextControl)
DEFINE_TEXTCTRL_CONST_FORWARDER(bool, IsTextArea)
DEFINE_TEXTCTRL_CONST_FORWARDER(bool, IsPlainTextControl)
DEFINE_TEXTCTRL_CONST_FORWARDER(bool, IsPasswordTextControl)
DEFINE_TEXTCTRL_FORWARDER(PRInt32, GetCols)
DEFINE_TEXTCTRL_FORWARDER(PRInt32, GetWrapCols)
DEFINE_TEXTCTRL_FORWARDER(PRInt32, GetRows)
#undef DEFINE_TEXTCTRL_CONST_FORWARDER
#undef DEFINE_TEXTCTRL_FORWARDER
protected:
class EditorInitializer;
friend class EditorInitializer;
friend class nsTextEditorState; // needs access to UpdateValueDisplay
class EditorInitializer : public nsRunnable {
public:
EditorInitializer(nsTextControlFrame* aFrame) :
mFrame(aFrame) {}
NS_IMETHOD Run() {
if (mFrame) {
// need to block script to avoid bug 669767
nsAutoScriptBlocker scriptBlocker;
nsCOMPtr<nsIPresShell> shell =
mFrame->PresContext()->GetPresShell();
bool observes = shell->ObservesNativeAnonMutationsForPrint();
shell->ObserveNativeAnonMutationsForPrint(true);
// This can cause the frame to be destroyed (and call Revoke())
mFrame->EnsureEditorInitialized();
shell->ObserveNativeAnonMutationsForPrint(observes);
// The frame can *still* be destroyed even though we have a scriptblocker
// Bug 682684
if (!mFrame)
return NS_ERROR_FAILURE;
mFrame->FinishedInitializer();
}
return NS_OK;
}
// avoids use of nsWeakFrame
void Revoke() {
mFrame = nsnull;
}
private:
nsTextControlFrame* mFrame;
};
class ScrollOnFocusEvent;
friend class ScrollOnFocusEvent;
class ScrollOnFocusEvent : public nsRunnable {
public:
ScrollOnFocusEvent(nsTextControlFrame* aFrame) :
mFrame(aFrame) {}
NS_DECL_NSIRUNNABLE
void Revoke() {
mFrame = nsnull;
}
private:
nsTextControlFrame* mFrame;
};
nsresult DOMPointToOffset(nsIDOMNode* aNode, PRInt32 aNodeOffset, PRInt32 *aResult);
nsresult OffsetToDOMPoint(PRInt32 aOffset, nsIDOMNode** aResult, PRInt32* aPosition);
/**
* Find out whether this control is scrollable (i.e. if it is not a single
* line text control)
* @return whether this control is scrollable
*/
bool IsScrollable() const;
/**
* Update the textnode under our anonymous div to show the new
* value. This should only be called when we have no editor yet.
* @throws NS_ERROR_UNEXPECTED if the div has no text content
*/
nsresult UpdateValueDisplay(bool aNotify,
bool aBeforeEditorInit = false,
const nsAString *aValue = nsnull);
/**
* Get the maxlength attribute
* @param aMaxLength the value of the max length attr
* @returns false if attr not defined
*/
bool GetMaxLength(PRInt32* aMaxLength);
/**
* Find out whether an attribute exists on the content or not.
* @param aAtt the attribute to determine the existence of
* @returns false if it does not exist
*/
bool AttributeExists(nsIAtom *aAtt) const
{ return mContent && mContent->HasAttr(kNameSpaceID_None, aAtt); }
/**
* We call this when we are being destroyed or removed from the PFM.
* @param aPresContext the current pres context
*/
void PreDestroy();
// Compute our intrinsic size. This does not include any borders, paddings,
// etc. Just the size of our actual area for the text (and the scrollbars,
// for <textarea>).
nsresult CalcIntrinsicSize(nsRenderingContext* aRenderingContext,
nsSize& aIntrinsicSize);
nsresult ScrollSelectionIntoView();
private:
//helper methods
nsresult SetSelectionInternal(nsIDOMNode *aStartNode, PRInt32 aStartOffset,
nsIDOMNode *aEndNode, PRInt32 aEndOffset,
SelectionDirection aDirection = eNone);
nsresult SelectAllOrCollapseToEndOfText(bool aSelect);
nsresult SetSelectionEndPoints(PRInt32 aSelStart, PRInt32 aSelEnd,
SelectionDirection aDirection = eNone);
// accessors for the notify on input flag
bool GetNotifyOnInput() const { return mNotifyOnInput; }
void SetNotifyOnInput(bool val) { mNotifyOnInput = val; }
/**
* Return the root DOM element, and implicitly initialize the editor if needed.
*/
nsresult GetRootNodeAndInitializeEditor(nsIDOMElement **aRootElement);
void FinishedInitializer() {
Properties().Delete(TextControlInitializer());
}
private:
// these packed bools could instead use the high order bits on mState, saving 4 bytes
bool mUseEditor;
bool mIsProcessing;
bool mNotifyOnInput;//default this to off to stop any notifications until setup is complete
// Calls to SetValue will be treated as user values (i.e. trigger onChange
// eventually) when mFireChangeEventState==true, this is used by nsFileControlFrame.
bool mFireChangeEventState;
// Keep track if we have asked a placeholder node creation.
bool mUsePlaceholder;
#ifdef DEBUG
bool mInEditorInitialization;
friend class EditorInitializerEntryTracker;
#endif
nsString mFocusedValue;
nsRevocableEventPtr<ScrollOnFocusEvent> mScrollEvent;
};
#endif