Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/C/Firefox/layout/forms/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 9 kB

Quelle nsListControlFrame.h Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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___

#include "mozilla/Attributes.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/StaticPtr.h"
#include "nsISelectControlFrame.h"
#include "nsSelectsAreaFrame.h"

class nsComboboxControlFrame;
class nsPresContext;

namespace mozilla {
class PresShell;
class HTMLSelectEventListener;

namespace dom {
class Event;
class HTMLOptionElement;
class HTMLSelectElement;
class HTMLOptionsCollection;
}  // namespace dom
}  // namespace mozilla

/**
* Frame-based listbox.
*/

class nsListControlFrame final : public mozilla::ScrollContainerFrame,
                                 public nsISelectControlFrame {
public:
  using HTMLOptionElement = mozilla::dom::HTMLOptionElement;

  friend nsListControlFrame* NS_NewListControlFrame(
      mozilla::PresShell* aPresShell, ComputedStyle* aStyle);

  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS(nsListControlFrame)

  Maybe<nscoord> GetNaturalBaselineBOffset(
      mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup,
      BaselineExportContext) const override;

  // nsIFrame
  nsresult HandleEvent(nsPresContext* aPresContext,
                       mozilla::WidgetGUIEvent* aEvent,
                       nsEventStatus* aEventStatus) final;

  void SetInitialChildList(ChildListID aListID, nsFrameList&& aChildList) final;

  nscoord IntrinsicISize(const mozilla::IntrinsicSizeInput& aInput,
                         mozilla::IntrinsicISizeType aType) final;

  void Reflow(nsPresContext* aCX, ReflowOutput& aDesiredSize,
              const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;

  void Init(nsIContent* aContent, nsContainerFrame* aParent,
            nsIFrame* aPrevInFlow) final;

  bool ReflowFinished() final;
  void Destroy(DestroyContext&) override;

  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
                        const nsDisplayListSet& aLists) final;

  nsContainerFrame* GetContentInsertionFrame() final;

  int32_t GetEndSelectionIndex() const { return mEndSelectionIndex; }

  mozilla::dom::HTMLOptionElement* GetCurrentOption() const;

#ifdef DEBUG_FRAME_DUMP
  nsresult GetFrameName(nsAString& aResult) const final;
#endif

  void ElementStateChanged(mozilla::dom::ElementState aStates) final;
  bool ShouldPropagateComputedBSizeToScrolledContent() const final;

  // for accessibility purposes
#ifdef ACCESSIBILITY
  mozilla::a11y::AccType AccessibleType() final;
#endif

  int32_t GetSelectedIndex();

  /**
   * 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.
   */
  void GetOptionText(uint32_t aIndex, nsAString& aStr);

  void CaptureMouseEvents(bool aGrabMouseEvents);
  nscoord GetBSizeOfARow();
  uint32_t GetNumberOfOptions();

  MOZ_CAN_RUN_SCRIPT_BOUNDARY void OnContentReset();

  // nsISelectControlFrame
  NS_IMETHOD AddOption(int32_t index) final;
  NS_IMETHOD RemoveOption(int32_t index) final;
  MOZ_CAN_RUN_SCRIPT_BOUNDARY
  NS_IMETHOD DoneAddingChildren(bool aIsDone) final;

  /**
   * Gets the content (an option) by index and then set it as
   * being selected or not selected.
   */
  MOZ_CAN_RUN_SCRIPT_BOUNDARY
  NS_IMETHOD OnOptionSelected(int32_t aIndex, bool aSelected) final;
  MOZ_CAN_RUN_SCRIPT_BOUNDARY
  NS_IMETHOD_(void)
  OnSetSelectedIndex(int32_t aOldIndex, int32_t aNewIndex) final;

  /**
   * Mouse event listeners.
   * @note These methods might destroy the frame, pres shell and other objects.
   */
  MOZ_CAN_RUN_SCRIPT
  nsresult HandleLeftButtonMouseDown(mozilla::dom::Event* aMouseEvent);
  MOZ_CAN_RUN_SCRIPT
  nsresult HandleLeftButtonMouseUp(mozilla::dom::Event* aMouseEvent);
  MOZ_CAN_RUN_SCRIPT
  nsresult DragMove(mozilla::dom::Event* aMouseEvent);
  MOZ_CAN_RUN_SCRIPT

  MOZ_CAN_RUN_SCRIPT
  bool PerformSelection(int32_t aClickedIndex, bool aIsShift, bool aIsControl);
  MOZ_CAN_RUN_SCRIPT
  void UpdateSelectionAfterKeyEvent(int32_t aNewIndex, uint32_t aCharCode,
                                    bool aIsShift, bool aIsControlOrMeta,
                                    bool aIsControlSelectMode);

  /**
   * Returns the options collection for mContent, if any.
   */
  mozilla::dom::HTMLOptionsCollection* GetOptions() const;
  /**
   * Returns the HTMLOptionElement for a given index in mContent's collection.
   */
  HTMLOptionElement* GetOption(uint32_t aIndex) const;

  // Helper
  bool IsFocused() const;

  /**
   * 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(mozilla::gfx::DrawTarget* aDrawTarget, 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 block size of a row, for use with the
   * "size" attribute.
   * Can't be const because GetNumberOfOptions() isn't const.
   */
  nscoord CalcBSizeOfARow();

  /**
   * 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) {
    ScrollContainerFrame::SetSuppressScrollbarUpdate(aSuppress);
  }

  /**
   * Return the number of displayed rows in the list.
   */
  uint32_t GetNumDisplayRows() const { return mNumDisplayRows; }

#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(
      nsIContent* aPreviousOption);  // 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|.
   */
  MOZ_CAN_RUN_SCRIPT
  bool UpdateSelection();

  /**
   * Returns whether mContent supports multiple selection.
   */
  bool GetMultiple() const;

  mozilla::dom::HTMLSelectElement& Select() const;

  /**
   * @return true if the <option> at aIndex is selectable by the user.
   */
  bool IsOptionInteractivelySelectable(int32_t aIndex) const;
  /**
   * @return true if aOption in aSelect is selectable by the user.
   */
  static bool IsOptionInteractivelySelectable(
      mozilla::dom::HTMLSelectElement* aSelect,
      mozilla::dom::HTMLOptionElement* aOption);

  MOZ_CAN_RUN_SCRIPT void ScrollToFrame(HTMLOptionElement& aOptElement);

  MOZ_CAN_RUN_SCRIPT void ScrollToIndex(int32_t anIndex);

public:
  /**
   * Resets the select back to it's original default values;
   * those values as determined by the original HTML
   */
  MOZ_CAN_RUN_SCRIPT void ResetList(bool aAllowScrolling);

protected:
  explicit nsListControlFrame(ComputedStyle* aStyle,
                              nsPresContext* aPresContext);
  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(mozilla::dom::Event* aMouseEvent,
                                int32_t& aCurIndex);

  bool CheckIfAllFramesHere();

  // guess at a row block size based on our own style.
  nscoord CalcFallbackRowBSize(float aFontSizeInflation);

  // CalcIntrinsicBSize computes our intrinsic block size (taking the
  // "size" attribute into account).  This should only be called in
  // non-dropdown mode.
  nscoord CalcIntrinsicBSize(nscoord aBSizeOfARow, int32_t aNumberOfOptions);

  // Dropped down stuff
  void SetComboboxItem(int32_t aIndex);

  // Selection
  bool SetOptionsSelectedFromFrame(int32_t aStartIndex, int32_t aEndIndex,
                                   bool aValue, bool aClearAll);
  bool ToggleOptionSelectedFromFrame(int32_t aIndex);

  MOZ_CAN_RUN_SCRIPT
  bool SingleSelection(int32_t aClickedIndex, bool aDoToggle);
  bool ExtendedSelection(int32_t aStartIndex, int32_t aEndIndex,
                         bool aClearAll);
  MOZ_CAN_RUN_SCRIPT
  bool HandleListSelection(mozilla::dom::Event* aDOMEvent,
                           int32_t selectedIndex);
  void InitSelectionRange(int32_t aClickedIndex);

public:
  nsSelectsAreaFrame* GetOptionsContainer() const {
    return static_cast<nsSelectsAreaFrame*>(GetScrolledFrame());
  }

  static constexpr int32_t kNothingSelected = -1;

protected:
  nscoord BSizeOfARow() { return GetOptionsContainer()->BSizeOfARow(); }

  /**
   * @return how many displayable options/optgroups this frame has.
   */
  uint32_t GetNumberOfRows();

  // Data Members
  int32_t mStartSelectionIndex = 0;
  int32_t mEndSelectionIndex = 0;

  uint32_t mNumDisplayRows = 0;
  bool mChangesSinceDragStart : 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;

  // 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;

  // True if our reflow got interrupted.
  bool mReflowWasInterrupted : 1;

  RefPtr<mozilla::HTMLSelectEventListener> mEventListener;

  static nsListControlFrame* sFocused;
};

#endif /* nsListControlFrame_h___ */

quality100%

¤ Dauer der Verarbeitung: 0.14 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.