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The Tor Browser
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nsComboboxControlFrame.h (4460B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef nsComboboxControlFrame_h___
      8 #define nsComboboxControlFrame_h___
      9 
     10 #include "ButtonControlFrame.h"
     11 #include "mozilla/Attributes.h"
     12 #include "nsIAnonymousContentCreator.h"
     13 #include "nsIRollupListener.h"
     14 #include "nsISelectControlFrame.h"
     15 #include "nsThreadUtils.h"
     16 
     17 namespace mozilla {
     18 class PresShell;
     19 class HTMLSelectEventListener;
     20 class ComboboxLabelFrame;
     21 namespace dom {
     22 class HTMLSelectElement;
     23 }
     24 }  // namespace mozilla
     25 
     26 class nsComboboxControlFrame final : public mozilla::ButtonControlFrame,
     27                                     public nsISelectControlFrame {
     28  using Element = mozilla::dom::Element;
     29 
     30 public:
     31  friend class mozilla::ComboboxLabelFrame;
     32  explicit nsComboboxControlFrame(ComputedStyle* aStyle,
     33                                  nsPresContext* aPresContext);
     34  ~nsComboboxControlFrame();
     35 
     36  NS_DECL_QUERYFRAME
     37  NS_DECL_FRAMEARENA_HELPERS(nsComboboxControlFrame)
     38 
     39  // nsIAnonymousContentCreator
     40  nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) final;
     41  void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
     42                                uint32_t aFilter) final;
     43 
     44 #ifdef ACCESSIBILITY
     45  mozilla::a11y::AccType AccessibleType() final;
     46 #endif
     47 
     48  nscoord IntrinsicISize(const mozilla::IntrinsicSizeInput& aInput,
     49                         mozilla::IntrinsicISizeType aType) final;
     50  void GetLabelText(nsAString&);
     51  void UpdateLabelText();
     52 
     53  void Reflow(nsPresContext* aCX, ReflowOutput& aDesiredSize,
     54              const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;
     55 
     56  MOZ_CAN_RUN_SCRIPT_BOUNDARY
     57  nsresult HandleEvent(nsPresContext* aPresContext,
     58                       mozilla::WidgetGUIEvent* aEvent,
     59                       nsEventStatus* aEventStatus) final;
     60 
     61  void Init(nsIContent* aContent, nsContainerFrame* aParent,
     62            nsIFrame* aPrevInFlow) final;
     63  void Destroy(DestroyContext&) final;
     64 
     65 #ifdef DEBUG_FRAME_DUMP
     66  nsresult GetFrameName(nsAString& aResult) const final {
     67    return MakeFrameName(u"ComboboxControl"_ns, aResult);
     68  }
     69 #endif
     70 
     71  /**
     72   * @note This method might destroy |this|.
     73   */
     74  void FireValueChangeEvent();
     75  nsresult RedisplaySelectedText();
     76 
     77  bool IsDroppedDown() const;
     78 
     79  // nsISelectControlFrame
     80  NS_IMETHOD AddOption(int32_t index) final;
     81  NS_IMETHOD RemoveOption(int32_t index) final;
     82  NS_IMETHOD DoneAddingChildren(bool aIsDone) final;
     83  NS_IMETHOD OnOptionSelected(int32_t aIndex, bool aSelected) final;
     84  NS_IMETHOD_(void)
     85  OnSetSelectedIndex(int32_t aOldIndex, int32_t aNewIndex) final;
     86 
     87  int32_t CharCountOfLargestOptionForInflation() const;
     88 
     89 protected:
     90  friend class RedisplayTextEvent;
     91  friend class nsAsyncResize;
     92  friend class nsResizeDropdownAtFinalPosition;
     93 
     94  // Return true if we should render a dropdown button.
     95  bool HasDropDownButton() const;
     96  nscoord DropDownButtonISize();
     97 
     98  enum class Type { Longest, Current };
     99  nscoord GetOptionISize(gfxContext*, Type) const;
    100 
    101  class RedisplayTextEvent : public mozilla::Runnable {
    102   public:
    103    NS_DECL_NSIRUNNABLE
    104    explicit RedisplayTextEvent(nsComboboxControlFrame* c)
    105        : mozilla::Runnable("nsComboboxControlFrame::RedisplayTextEvent"),
    106          mControlFrame(c) {}
    107    void Revoke() { mControlFrame = nullptr; }
    108 
    109   private:
    110    nsComboboxControlFrame* mControlFrame;
    111  };
    112 
    113  nsresult RedisplayText();
    114  void HandleRedisplayTextEvent();
    115 
    116  mozilla::dom::HTMLSelectElement& Select() const;
    117  void GetOptionText(uint32_t aIndex, nsAString& aText) const;
    118 
    119  // TODO(emilio): Would be nice to either paint the dropmarker as part of the
    120  // background somehow, or alternatively rejigger stuff a bit (using flex) so
    121  // that we can get rid of the label element.
    122  RefPtr<Element> mDisplayLabel;   // Anonymous content for the label
    123  RefPtr<Element> mButtonContent;  // Anonymous content for the button
    124  nsRevocableEventPtr<RedisplayTextEvent> mRedisplayTextEvent;
    125 
    126  // The inline size of our display area. Used by that frame's reflow to size to
    127  // the full inline size except the drop-marker.
    128  nscoord mDisplayISize = 0;
    129  int32_t mDisplayedIndex = -1;
    130  RefPtr<mozilla::HTMLSelectEventListener> mEventListener;
    131 };
    132 
    133 #endif