gecko-dev/layout/xul/nsMenuFrame.h

289 lines
9.6 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
//
// nsMenuFrame
//
#ifndef nsMenuFrame_h__
#define nsMenuFrame_h__
#include "nsIAtom.h"
#include "nsCOMPtr.h"
#include "nsBoxFrame.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsMenuParent.h"
#include "nsXULPopupManager.h"
#include "nsITimer.h"
#include "mozilla/Attributes.h"
nsIFrame* NS_NewMenuFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame* NS_NewMenuItemFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
class nsIContent;
#define NS_STATE_ACCELTEXT_IS_DERIVED NS_STATE_BOX_CHILD_RESERVED
// the type of menuitem
enum nsMenuType {
// a normal menuitem where a command is carried out when activated
eMenuType_Normal = 0,
// a menuitem with a checkmark that toggles when activated
eMenuType_Checkbox = 1,
// a radio menuitem where only one of it and its siblings with the same
// name attribute can be checked at a time
eMenuType_Radio = 2
};
enum nsMenuListType {
eNotMenuList, // not a menulist
eReadonlyMenuList, // <menulist/>
eEditableMenuList // <menulist editable="true"/>
};
class nsMenuFrame;
/**
* nsMenuTimerMediator is a wrapper around an nsMenuFrame which can be safely
* passed to timers. The class is reference counted unlike the underlying
* nsMenuFrame, so that it will exist as long as the timer holds a reference
* to it. The callback is delegated to the contained nsMenuFrame as long as
* the contained nsMenuFrame has not been destroyed.
*/
class nsMenuTimerMediator final : public nsITimerCallback
{
public:
explicit nsMenuTimerMediator(nsMenuFrame* aFrame);
NS_DECL_ISUPPORTS
NS_DECL_NSITIMERCALLBACK
void ClearFrame();
private:
~nsMenuTimerMediator();
// Pointer to the wrapped frame.
nsMenuFrame* mFrame;
};
class nsMenuFrame final : public nsBoxFrame
{
public:
explicit nsMenuFrame(nsStyleContext* aContext);
NS_DECL_QUERYFRAME_TARGET(nsMenuFrame)
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState) override;
virtual nsSize GetMinSize(nsBoxLayoutState& aBoxLayoutState) override;
virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState) override;
virtual void Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
#ifdef DEBUG_LAYOUT
virtual nsresult SetDebug(nsBoxLayoutState& aState, bool aDebug) override;
#endif
// The following methods are all overridden so that the menupopup
// can be stored in a separate list, so that it doesn't impact reflow of the
// actual menu item at all.
virtual const nsFrameList& GetChildList(ChildListID aList) const override;
virtual void GetChildLists(nsTArray<ChildList>* aLists) const override;
virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
// Overridden to prevent events from going to children of the menu.
virtual void BuildDisplayListForChildren(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) override;
// this method can destroy the frame
virtual nsresult HandleEvent(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
virtual void SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) override;
virtual void AppendFrames(ChildListID aListID,
nsFrameList& aFrameList) override;
virtual void InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList) override;
virtual void RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame) override;
virtual nsIAtom* GetType() const override { return nsGkAtoms::menuFrame; }
NS_IMETHOD SelectMenu(bool aActivateFlag);
virtual nsIScrollableFrame* GetScrollTargetFrame() override;
// Retrieve the element that the menu should be anchored to. By default this is
// the menu itself. However, the anchor attribute may refer to the value of an
// anonid within the menu's binding, or, if not found, the id of an element in
// the document.
nsIContent* GetAnchor();
/**
* NOTE: OpenMenu will open the menu asynchronously.
*/
void OpenMenu(bool aSelectFirstItem);
// CloseMenu closes the menu asynchronously
void CloseMenu(bool aDeselectMenu);
bool IsChecked() { return mChecked; }
NS_IMETHOD GetActiveChild(nsIDOMElement** aResult);
NS_IMETHOD SetActiveChild(nsIDOMElement* aChild);
// called when the Enter key is pressed while the menuitem is the current
// one in its parent popup. This will carry out the command attached to
// the menuitem. If the menu should be opened, this frame will be returned,
// otherwise null will be returned.
nsMenuFrame* Enter(mozilla::WidgetGUIEvent* aEvent);
// Return the nearest menu bar or menupopup ancestor frame.
nsMenuParent* GetMenuParent() const;
const nsAString& GetRadioGroupName() { return mGroupName; }
nsMenuType GetMenuType() { return mType; }
nsMenuPopupFrame* GetPopup();
/**
* @return true if this frame has a popup child frame.
*/
bool HasPopup() const
{
return (GetStateBits() & NS_STATE_MENU_HAS_POPUP_LIST) != 0;
}
// nsMenuFrame methods
bool IsOnMenuBar() const
{
nsMenuParent* menuParent = GetMenuParent();
return menuParent && menuParent->IsMenuBar();
}
bool IsOnActiveMenuBar() const
{
nsMenuParent* menuParent = GetMenuParent();
return menuParent && menuParent->IsMenuBar() && menuParent->IsActive();
}
virtual bool IsOpen();
virtual bool IsMenu();
nsMenuListType GetParentMenuListType();
bool IsDisabled();
void ToggleMenuState();
// indiciate that the menu's popup has just been opened, so that the menu
// can update its open state. This method modifies the open attribute on
// the menu, so the frames could be gone after this call.
void PopupOpened();
// indiciate that the menu's popup has just been closed, so that the menu
// can update its open state. The menu should be unhighlighted if
// aDeselectedMenu is true. This method modifies the open attribute on
// the menu, so the frames could be gone after this call.
void PopupClosed(bool aDeselectMenu);
// returns true if this is a menu on another menu popup. A menu is a submenu
// if it has a parent popup or menupopup.
bool IsOnMenu() const
{
nsMenuParent* menuParent = GetMenuParent();
return menuParent && menuParent->IsMenu();
}
void SetIsMenu(bool aIsMenu) { mIsMenu = aIsMenu; }
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const override
{
return MakeFrameName(NS_LITERAL_STRING("Menu"), aResult);
}
#endif
static bool IsSizedToPopup(nsIContent* aContent, bool aRequireAlways);
protected:
friend class nsMenuTimerMediator;
friend class nsASyncMenuInitialization;
friend class nsMenuAttributeChangedEvent;
/**
* Initialize the popup list to the first popup frame within
* aChildList. Removes the popup, if any, from aChildList.
*/
void SetPopupFrame(nsFrameList& aChildList);
/**
* Get the popup frame list from the frame property.
* @return the property value if it exists, nullptr otherwise.
*/
nsFrameList* GetPopupList() const;
/**
* Destroy the popup list property. The list must exist and be empty.
*/
void DestroyPopupList();
// Update the menu's type (normal, checkbox, radio).
// This method can destroy the frame.
void UpdateMenuType(nsPresContext* aPresContext);
// Update the checked state of the menu, and for radios, clear any other
// checked items. This method can destroy the frame.
void UpdateMenuSpecialState(nsPresContext* aPresContext);
// Examines the key node and builds the accelerator.
void BuildAcceleratorText(bool aNotify);
// Called to execute our command handler. This method can destroy the frame.
void Execute(mozilla::WidgetGUIEvent *aEvent);
// This method can destroy the frame
virtual nsresult AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType) override;
virtual ~nsMenuFrame() { }
bool SizeToPopup(nsBoxLayoutState& aState, nsSize& aSize);
bool ShouldBlink();
void StartBlinking(mozilla::WidgetGUIEvent* aEvent, bool aFlipChecked);
void StopBlinking();
void CreateMenuCommandEvent(mozilla::WidgetGUIEvent* aEvent,
bool aFlipChecked);
void PassMenuCommandEventToPopupManager();
protected:
#ifdef DEBUG_LAYOUT
nsresult SetDebug(nsBoxLayoutState& aState, nsIFrame* aList, bool aDebug);
#endif
nsresult Notify(nsITimer* aTimer);
bool mIsMenu; // Whether or not we can even have children or not.
bool mChecked; // are we checked?
bool mIgnoreAccelTextChange; // temporarily set while determining the accelerator key
nsMenuType mType;
// Reference to the mediator which wraps this frame.
nsRefPtr<nsMenuTimerMediator> mTimerMediator;
nsCOMPtr<nsITimer> mOpenTimer;
nsCOMPtr<nsITimer> mBlinkTimer;
uint8_t mBlinkState; // 0: not blinking, 1: off, 2: on
nsRefPtr<nsXULMenuCommandEvent> mDelayedMenuCommandEvent;
nsString mGroupName;
}; // class nsMenuFrame
#endif