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Bug 1161634 - Allow synthesizing native mouse-scroll events on Linux. r=karlt

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This commit is contained in:
Kartikaya Gupta 2015-05-11 17:21:34 -04:00
parent 4977bd28c8
commit 1e286139fc
2 changed files with 69 additions and 0 deletions
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60
widget/gtk/nsWindow.cpp
View File

@ -6596,3 +6596,63 @@ nsWindow::SynthesizeNativeMouseEvent(LayoutDeviceIntPoint aPoint,
return NS_OK;
}
nsresult
nsWindow::SynthesizeNativeMouseScrollEvent(mozilla::LayoutDeviceIntPoint aPoint,
uint32_t aNativeMessage,
double aDeltaX,
double aDeltaY,
double aDeltaZ,
uint32_t aModifierFlags,
uint32_t aAdditionalFlags,
nsIObserver* aObserver)
{
AutoObserverNotifier notifier(aObserver, "mousescrollevent");
if (!mGdkWindow) {
return NS_OK;
}
GdkEvent event;
memset(&event, 0, sizeof(GdkEvent));
event.type = GDK_SCROLL;
event.scroll.window = mGdkWindow;
event.scroll.time = GDK_CURRENT_TIME;
#if (MOZ_WIDGET_GTK == 3)
// Get device for event source
GdkDisplay* display = gdk_window_get_display(mGdkWindow);
GdkDeviceManager *device_manager = gdk_display_get_device_manager(display);
event.scroll.device = gdk_device_manager_get_client_pointer(device_manager);
#endif
event.scroll.x_root = aPoint.x;
event.scroll.y_root = aPoint.y;
LayoutDeviceIntPoint pointInWindow = aPoint - WidgetToScreenOffset();
event.scroll.x = pointInWindow.x;
event.scroll.y = pointInWindow.y;
// The delta values are backwards on Linux compared to Windows and Cocoa,
// hence the negation.
#if GTK_CHECK_VERSION(3,4,0)
// TODO: is this correct? I don't have GTK 3.4+ so I can't check
event.scroll.direction = GDK_SCROLL_SMOOTH;
event.scroll.delta_x = -aDeltaX;
event.scroll.delta_y = -aDeltaY;
#else
if (aDeltaX < 0) {
event.scroll.direction = GDK_SCROLL_RIGHT;
} else if (aDeltaX > 0) {
event.scroll.direction = GDK_SCROLL_LEFT;
} else if (aDeltaY < 0) {
event.scroll.direction = GDK_SCROLL_DOWN;
} else if (aDeltaY > 0) {
event.scroll.direction = GDK_SCROLL_UP;
} else {
return NS_OK;
}
#endif
gdk_event_put(&event);
return NS_OK;
}

9
widget/gtk/nsWindow.h
View File

@ -306,6 +306,15 @@ public:
nsIObserver* aObserver) override
{ return SynthesizeNativeMouseEvent(aPoint, GDK_MOTION_NOTIFY, 0, aObserver); }
virtual nsresult SynthesizeNativeMouseScrollEvent(mozilla::LayoutDeviceIntPoint aPoint,
uint32_t aNativeMessage,
double aDeltaX,
double aDeltaY,
double aDeltaZ,
uint32_t aModifierFlags,
uint32_t aAdditionalFlags,
nsIObserver* aObserver) override;
protected:
virtual ~nsWindow();