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gecko-dev/widget/nsIWidget.h

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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 "nsCoord.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "nsStringGlue.h"
#include "prthread.h"
#include "nsEvent.h"
#include "nsCOMPtr.h"
#include "nsITheme.h"
#include "nsNativeWidget.h"
#include "nsWidgetInitData.h"
#include "nsTArray.h"
#include "nsXULAppAPI.h"
#include "LayersTypes.h"
// forward declarations
class nsFontMetrics;
class nsRenderingContext;
class nsDeviceContext;
struct nsFont;
class nsIRollupListener;
class nsGUIEvent;
class imgIContainer;
class gfxASurface;
class nsIContent;
class ViewWrapper;
class nsIWidgetListener;
class nsIntRegion;
namespace mozilla {
namespace dom {
class TabChild;
}
namespace layers {
class CompositorChild;
class LayerManager;
class PLayersChild;
}
}
/**
* Callback function that processes events.
*
* The argument is actually a subtype (subclass) of nsEvent 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)(nsGUIEvent *event);
/**
* 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
#define NS_NATIVE_SHELLWIDGET 10 // Get the shell GtkWidget
// 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 \
{ 0x4e05b167, 0x475b, 0x422b, \
{ 0x88, 0xc0, 0xa5, 0xb1, 0x61, 0xcf, 0x87, 0x79 } }
/*
* 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
/**
* 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
};
/**
* Preference for receiving IME updates
*
* If mWantUpdates is true, PuppetWidget will forward
* nsIWidget::OnIMETextChange and nsIWidget::OnIMESelectionChange to the chrome
* process. This incurs overhead from observers and IPDL. If the IME
* implementation on a particular platform doesn't care about OnIMETextChange
* and OnIMESelectionChange from content processes, they should set
* mWantUpdates to false to avoid these overheads.
*
* 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 {
nsIMEUpdatePreference()
: mWantUpdates(false), mWantHints(false)
{
}
nsIMEUpdatePreference(bool aWantUpdates, bool aWantHints)
: mWantUpdates(aWantUpdates), mWantHints(aWantHints)
{
}
bool 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 {
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;
};
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;
};
} // 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::CompositorChild CompositorChild;
typedef mozilla::layers::LayerManager LayerManager;
typedef mozilla::layers::LayersBackend LayersBackend;
typedef mozilla::layers::PLayersChild PLayersChild;
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)
{}
/**
* 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
* nsIView 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;
/**
* 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".
*/
virtual double GetDefaultScale() = 0;
/**
* 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;
/**
* 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(int32_t aX, int32_t 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(int32_t aX, int32_t 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(int32_t aWidth,
int32_t 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(int32_t aX,
int32_t aY,
int32_t aWidth,
int32_t 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(int32_t aWidth,
int32_t 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(int32_t aX,
int32_t aY,
int32_t aWidth,
int32_t 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 nsGUIEvent.h)
*/
NS_IMETHOD SetSizeMode(int32_t aMode) = 0;
/**
* Return size mode (minimized, maximized, normalized).
* Returns a value from nsSizeMode (see nsGUIEvent.h)
*/
NS_IMETHOD GetSizeMode(int32_t* aMode) = 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(PLayersChild* aShadowManager,
LayersBackend aBackendHint,
LayerManagerPersistence aPersistence = LAYER_MANAGER_CURRENT,
bool* aAllowRetaining = nullptr) = 0;
/**
* Called before the LayerManager draws the layer tree.
*
* @param aManager The drawing LayerManager.
* @param aWidgetRect The current widget rect that is being drawn.
*/
virtual void DrawWindowUnderlay(LayerManager* aManager, nsIntRect aRect) = 0;
/**
* Called after the LayerManager draws the layer tree
*
* @param aManager The drawing LayerManager.
* @param aRect Current widget rect that is being drawn.
*/
virtual void DrawWindowOverlay(LayerManager* aManager, nsIntRect aRect) = 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(nsGUIEvent* 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
* dropdown to be rolled up, This method ignores the aConsumeRollupEvent
* parameter when aDoCapture is FALSE
* @param aDoCapture true enables capture, false disables capture
* @param aConsumeRollupEvent true consumes the rollup event, false dispatches rollup event
*
*/
NS_IMETHOD CaptureRollupEvents(nsIRollupListener * aListener, bool aDoCapture,
bool aConsumeRollupEvent) = 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;
/**
* Called when when we need to begin secure keyboard input, such as when a password field
* gets focus.
*
* NOTE: Calls to this method may not be nested and you can only enable secure keyboard input
* for one widget at a time.
*/
NS_IMETHOD BeginSecureKeyboardInput() = 0;
/**
* Called when when we need to end secure keyboard input, such as when a password field
* loses focus.
*
* NOTE: Calls to this method may not be nested and you can only enable secure keyboard input
* for one widget at a time.
*/
NS_IMETHOD EndSecureKeyboardInput() = 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(nsGUIEvent* aEvent, int32_t aHorizontal, int32_t aVertical) = 0;
/**
* Begin a window moving drag, based on the event passed in.
*/
NS_IMETHOD BeginMoveDrag(nsMouseEvent* 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;
/*
* Force Input Method Editor to commit the uncommitted input
*/
NS_IMETHOD ResetInputState()=0;
/*
* Following methods relates to IME 'Opened'/'Closed' state.
* 'Opened' means the user can input any character. I.e., users can input Japanese
* and other characters. The user can change the state to 'Closed'.
* 'Closed' means the user can input ASCII characters only. This is the same as a
* non-IME environment. The user can change the state to 'Opened'.
* For more information is here.
* http://bugzilla.mozilla.org/show_bug.cgi?id=16940#c48
*/
/*
* Destruct and don't commit the IME composition string.
*/
NS_IMETHOD CancelIMEComposition() = 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 accelerated rendering to 'True' or 'False'
*/
NS_IMETHOD SetAcceleratedRendering(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;
/*
* An editable node (i.e. input/textarea/design mode document)
* is receiving or giving up focus
* aFocus is true if node is receiving focus
* aFocus is false if node is giving up focus (blur)
*
* If this returns NS_ERROR_*, OnIMETextChange and OnIMESelectionChange
* and OnIMEFocusChange(false) will be never called.
*
* If this returns NS_SUCCESS_IME_NO_UPDATES, OnIMEFocusChange(false)
* will be called but OnIMETextChange and OnIMESelectionChange will NOT.
*/
NS_IMETHOD OnIMEFocusChange(bool aFocus) = 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 OnIMETextChange(uint32_t aStart,
uint32_t aOldEnd,
uint32_t aNewEnd) = 0;
/*
* Selection has changed in the focused node
*/
NS_IMETHOD OnIMESelectionChange(void) = 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 aOriginalDelta The delta value of the current mouse wheel
* scrolling event.
* @param aIsHorizontal If TRUE, the scrolling direction is horizontal.
* Otherwise, it's vertical.
* @param aOverriddenDelta The overridden mouse scrolling speed. This value
* may be same as aOriginalDelta.
*/
NS_IMETHOD OverrideSystemMouseScrollSpeed(int32_t aOriginalDelta,
bool aIsHorizontal,
int32_t &aOverriddenDelta) = 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() {
return true;
}
/**
* 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; }
protected:
// 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;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIWidget, NS_IWIDGET_IID)
#endif // nsIWidget_h__
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