The Tor Browser: layout/forms/nsListControlFrame.h@6474c204b198 (annotated)

layout/forms/nsListControlFrame.h@6474c204b198 (annotated)

layout/forms/nsListControlFrame.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

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

The Tor Browser / annotate

layout/forms/nsListControlFrame.h@6474c204b198 (annotated)

layout/forms/nsListControlFrame.h