зеркало из https://github.com/mozilla/gecko-dev.git
478 строки
15 KiB
C++
478 строки
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsListControlFrame_h___
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#define nsListControlFrame_h___
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#ifdef DEBUG_evaughan
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//#define DEBUG_rods
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#endif
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#ifdef DEBUG_rods
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//#define DO_REFLOW_DEBUG
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//#define DO_REFLOW_COUNTER
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//#define DO_UNCONSTRAINED_CHECK
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//#define DO_PIXELS
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#endif
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#include "mozilla/Attributes.h"
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#include "nsGfxScrollFrame.h"
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#include "nsIFormControlFrame.h"
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#include "nsIListControlFrame.h"
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#include "nsISelectControlFrame.h"
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#include "nsAutoPtr.h"
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#include "nsSelectsAreaFrame.h"
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// X.h defines KeyPress
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#ifdef KeyPress
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#undef KeyPress
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#endif
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class nsIComboboxControlFrame;
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class nsPresContext;
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class nsListEventListener;
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namespace mozilla {
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namespace dom {
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class HTMLOptionElement;
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class HTMLOptionsCollection;
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} // namespace dom
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} // namespace mozilla
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/**
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* Frame-based listbox.
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*/
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class nsListControlFrame final : public nsHTMLScrollFrame,
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public nsIFormControlFrame,
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public nsIListControlFrame,
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public nsISelectControlFrame
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{
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public:
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friend nsContainerFrame* NS_NewListControlFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext);
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS
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// nsIFrame
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virtual nsresult HandleEvent(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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virtual void SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList) override;
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virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
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virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
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virtual void Reflow(nsPresContext* aCX,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus) override;
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virtual void Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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virtual void DidReflow(nsPresContext* aPresContext,
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const nsHTMLReflowState* aReflowState,
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nsDidReflowStatus aStatus) override;
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virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists) override;
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virtual nsContainerFrame* GetContentInsertionFrame() override;
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::scrollFrame
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*/
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virtual nsIAtom* GetType() const override;
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virtual bool IsFrameOfType(uint32_t aFlags) const override
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{
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return nsHTMLScrollFrame::IsFrameOfType(aFlags &
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~(nsIFrame::eReplaced | nsIFrame::eReplacedContainsBlock));
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}
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override;
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#endif
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// nsIFormControlFrame
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virtual nsresult SetFormProperty(nsIAtom* aName, const nsAString& aValue) override;
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virtual void SetFocus(bool aOn = true, bool aRepaint = false) override;
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virtual mozilla::ScrollbarStyles GetScrollbarStyles() const override;
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virtual bool ShouldPropagateComputedBSizeToScrolledContent() const override;
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// for accessibility purposes
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#ifdef ACCESSIBILITY
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virtual mozilla::a11y::AccType AccessibleType() override;
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#endif
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// nsIListControlFrame
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virtual void SetComboboxFrame(nsIFrame* aComboboxFrame) override;
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virtual int32_t GetSelectedIndex() override;
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virtual mozilla::dom::HTMLOptionElement* GetCurrentOption() override;
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/**
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* Gets the text of the currently selected item.
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* If the there are zero items then an empty string is returned
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* If there is nothing selected, then the 0th item's text is returned.
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*/
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virtual void GetOptionText(uint32_t aIndex, nsAString& aStr) override;
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virtual void CaptureMouseEvents(bool aGrabMouseEvents) override;
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virtual nscoord GetBSizeOfARow() override;
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virtual uint32_t GetNumberOfOptions() override;
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virtual void AboutToDropDown() override;
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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virtual void AboutToRollup() override;
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/**
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* Dispatch a DOM onchange event synchroniously.
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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virtual void FireOnChange() override;
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/**
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* Makes aIndex the selected option of a combobox list.
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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virtual void ComboboxFinish(int32_t aIndex) override;
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virtual void OnContentReset() override;
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// nsISelectControlFrame
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NS_IMETHOD AddOption(int32_t index) override;
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NS_IMETHOD RemoveOption(int32_t index) override;
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NS_IMETHOD DoneAddingChildren(bool aIsDone) override;
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/**
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* Gets the content (an option) by index and then set it as
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* being selected or not selected.
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*/
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NS_IMETHOD OnOptionSelected(int32_t aIndex, bool aSelected) override;
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NS_IMETHOD OnSetSelectedIndex(int32_t aOldIndex, int32_t aNewIndex) override;
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/**
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* Mouse event listeners.
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* @note These methods might destroy the frame, pres shell and other objects.
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*/
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nsresult MouseDown(nsIDOMEvent* aMouseEvent);
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nsresult MouseUp(nsIDOMEvent* aMouseEvent);
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nsresult MouseMove(nsIDOMEvent* aMouseEvent);
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nsresult DragMove(nsIDOMEvent* aMouseEvent);
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nsresult KeyDown(nsIDOMEvent* aKeyEvent);
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nsresult KeyPress(nsIDOMEvent* aKeyEvent);
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/**
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* Returns the options collection for mContent, if any.
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*/
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mozilla::dom::HTMLOptionsCollection* GetOptions() const;
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/**
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* Returns the HTMLOptionElement for a given index in mContent's collection.
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*/
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mozilla::dom::HTMLOptionElement* GetOption(uint32_t aIndex) const;
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static void ComboboxFocusSet();
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// Helper
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bool IsFocused() { return this == mFocused; }
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/**
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* Function to paint the focus rect when our nsSelectsAreaFrame is painting.
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* @param aPt the offset of this frame, relative to the rendering reference
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* frame
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*/
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void PaintFocus(nsRenderingContext& aRC, nsPoint aPt);
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/**
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* If this frame IsFocused(), invalidates an area that includes anything
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* that PaintFocus will or could have painted --- basically the whole
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* GetOptionsContainer, plus some extra stuff if there are no options. This
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* must be called every time mEndSelectionIndex changes.
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*/
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void InvalidateFocus();
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/**
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* Function to calculate the block size of a row, for use with the
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* "size" attribute.
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* Can't be const because GetNumberOfOptions() isn't const.
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*/
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nscoord CalcBSizeOfARow();
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/**
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* Function to ask whether we're currently in what might be the
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* first pass of a two-pass reflow.
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*/
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bool MightNeedSecondPass() const {
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return mMightNeedSecondPass;
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}
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void SetSuppressScrollbarUpdate(bool aSuppress) {
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nsHTMLScrollFrame::SetSuppressScrollbarUpdate(aSuppress);
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}
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/**
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* Return whether the list is in dropdown mode.
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*/
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bool IsInDropDownMode() const;
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/**
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* Return the number of displayed rows in the list.
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*/
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uint32_t GetNumDisplayRows() const { return mNumDisplayRows; }
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/**
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* Return true if the drop-down list can display more rows.
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* (always false if not in drop-down mode)
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*/
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bool GetDropdownCanGrow() const { return mDropdownCanGrow; }
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/**
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* Dropdowns need views
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*/
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virtual bool NeedsView() override { return IsInDropDownMode(); }
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/**
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* Frees statics owned by this class.
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*/
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static void Shutdown();
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#ifdef ACCESSIBILITY
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/**
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* Post a custom DOM event for the change, so that accessibility can
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* fire a native focus event for accessibility
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* (Some 3rd party products need to track our focus)
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*/
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void FireMenuItemActiveEvent(); // Inform assistive tech what got focused
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#endif
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protected:
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/**
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* Updates the selected text in a combobox and then calls FireOnChange().
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* @note This method might destroy the frame, pres shell and other objects.
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* Returns false if calling it destroyed |this|.
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*/
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bool UpdateSelection();
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/**
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* Returns whether mContent supports multiple selection.
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*/
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bool GetMultiple() const {
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return mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::multiple);
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}
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/**
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* Toggles (show/hide) the combobox dropdown menu.
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void DropDownToggleKey(nsIDOMEvent* aKeyEvent);
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nsresult IsOptionDisabled(int32_t anIndex, bool &aIsDisabled);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void ScrollToFrame(mozilla::dom::HTMLOptionElement& aOptElement);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void ScrollToIndex(int32_t anIndex);
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/**
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* When the user clicks on the comboboxframe to show the dropdown
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* listbox, they then have to move the mouse into the list. We don't
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* want to process those mouse events as selection events (i.e., to
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* scroll list items into view). So we ignore the events until
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* the mouse moves below our border-inner-edge, when
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* mItemSelectionStarted is set.
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*
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* @param aPoint relative to this frame
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*/
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bool IgnoreMouseEventForSelection(nsIDOMEvent* aEvent);
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/**
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* If the dropdown is showing and the mouse has moved below our
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* border-inner-edge, then set mItemSelectionStarted.
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*/
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void UpdateInListState(nsIDOMEvent* aEvent);
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void AdjustIndexForDisabledOpt(int32_t aStartIndex, int32_t &anNewIndex,
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int32_t aNumOptions, int32_t aDoAdjustInc, int32_t aDoAdjustIncNext);
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/**
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* Resets the select back to it's original default values;
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* those values as determined by the original HTML
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*/
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virtual void ResetList(bool aAllowScrolling);
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explicit nsListControlFrame(nsStyleContext* aContext);
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virtual ~nsListControlFrame();
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/**
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* Sets the mSelectedIndex and mOldSelectedIndex from figuring out what
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* item was selected using content
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* @param aPoint the event point, in listcontrolframe coordinates
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* @return NS_OK if it successfully found the selection
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*/
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nsresult GetIndexFromDOMEvent(nsIDOMEvent* aMouseEvent, int32_t& aCurIndex);
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bool CheckIfAllFramesHere();
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bool IsLeftButton(nsIDOMEvent* aMouseEvent);
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// guess at a row block size based on our own style.
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nscoord CalcFallbackRowBSize(float aFontSizeInflation);
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// CalcIntrinsicBSize computes our intrinsic block size (taking the
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// "size" attribute into account). This should only be called in
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// non-dropdown mode.
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nscoord CalcIntrinsicBSize(nscoord aBSizeOfARow, int32_t aNumberOfOptions);
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// Dropped down stuff
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void SetComboboxItem(int32_t aIndex);
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/**
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* Method to reflow ourselves as a dropdown list. This differs from
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* reflow as a listbox because the criteria for needing a second
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* pass are different. This will be called from Reflow() as needed.
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*/
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void ReflowAsDropdown(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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// Selection
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bool SetOptionsSelectedFromFrame(int32_t aStartIndex,
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int32_t aEndIndex,
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bool aValue,
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bool aClearAll);
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bool ToggleOptionSelectedFromFrame(int32_t aIndex);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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bool SingleSelection(int32_t aClickedIndex, bool aDoToggle);
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bool ExtendedSelection(int32_t aStartIndex, int32_t aEndIndex,
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bool aClearAll);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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bool PerformSelection(int32_t aClickedIndex, bool aIsShift,
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bool aIsControl);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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bool HandleListSelection(nsIDOMEvent * aDOMEvent, int32_t selectedIndex);
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void InitSelectionRange(int32_t aClickedIndex);
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void PostHandleKeyEvent(int32_t aNewIndex, uint32_t aCharCode,
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bool aIsShift, bool aIsControlOrMeta);
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public:
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nsSelectsAreaFrame* GetOptionsContainer() const {
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return static_cast<nsSelectsAreaFrame*>(GetScrolledFrame());
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}
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protected:
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nscoord BSizeOfARow() {
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return GetOptionsContainer()->BSizeOfARow();
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}
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/**
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* @return how many displayable options/optgroups this frame has.
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*/
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uint32_t GetNumberOfRows();
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// Data Members
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int32_t mStartSelectionIndex;
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int32_t mEndSelectionIndex;
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nsIComboboxControlFrame *mComboboxFrame;
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uint32_t mNumDisplayRows;
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bool mChangesSinceDragStart:1;
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bool mButtonDown:1;
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// Has the user selected a visible item since we showed the
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// dropdown?
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bool mItemSelectionStarted:1;
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bool mIsAllContentHere:1;
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bool mIsAllFramesHere:1;
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bool mHasBeenInitialized:1;
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bool mNeedToReset:1;
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bool mPostChildrenLoadedReset:1;
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//bool value for multiple discontiguous selection
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bool mControlSelectMode:1;
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// True if we're in the middle of a reflow and might need a second
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// pass. This only happens for auto heights.
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bool mMightNeedSecondPass:1;
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/**
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* Set to aPresContext->HasPendingInterrupt() at the start of Reflow.
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* Set to false at the end of DidReflow.
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*/
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bool mHasPendingInterruptAtStartOfReflow:1;
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// True if the drop-down can show more rows. Always false if this list
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// is not in drop-down mode.
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bool mDropdownCanGrow:1;
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// True if the selection can be set to nothing or disabled options.
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bool mForceSelection:1;
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// The last computed block size we reflowed at if we're a combobox
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// dropdown.
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// XXXbz should we be using a subclass here? Or just not worry
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// about the extra member on listboxes?
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nscoord mLastDropdownComputedBSize;
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// At the time of our last dropdown, the backstop color to draw in case we
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// are translucent.
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nscolor mLastDropdownBackstopColor;
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nsRefPtr<nsListEventListener> mEventListener;
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static nsListControlFrame * mFocused;
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static nsString * sIncrementalString;
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#ifdef DO_REFLOW_COUNTER
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int32_t mReflowId;
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#endif
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private:
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// for incremental typing navigation
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static nsAString& GetIncrementalString ();
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static DOMTimeStamp gLastKeyTime;
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class MOZ_STACK_CLASS AutoIncrementalSearchResetter
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{
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public:
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AutoIncrementalSearchResetter() :
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mCancelled(false)
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{
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}
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~AutoIncrementalSearchResetter()
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{
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if (!mCancelled) {
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nsListControlFrame::GetIncrementalString().Truncate();
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}
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}
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void Cancel()
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{
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mCancelled = true;
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}
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private:
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bool mCancelled;
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};
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};
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#endif /* nsListControlFrame_h___ */
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