AButton.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  AButton.h
 
  Dominic Mazzoni
 
 
**********************************************************************/
 
#ifndef __AUDACITY_BUTTON__
#define __AUDACITY_BUTTON__
 
#include <vector>
#include <array>
#include <memory>
 
#include <wx/setup.h> // for wxUSE_* macros
#include <wx/window.h> // to inherit
#include <wx/image.h>
 
class wxImage;
class TranslatableString;
 
#if wxUSE_ACCESSIBILITY
#include "WindowAccessible.h"
 
class AButtonAx : public WindowAccessible
{
public:
   AButtonAx(wxWindow * window);
 
   virtual ~ AButtonAx();
 
   // Performs the default action. childId is 0 (the action for this object)
   // or > 0 (the action for a child).
   // Return wxACC_NOT_SUPPORTED if there is no default action for this
   // window (e.g. an edit control).
   wxAccStatus DoDefaultAction(int childId) override;
 
   // Retrieves the address of an IDispatch interface for the specified child.
   // All objects must support this property.
   wxAccStatus GetChild(int childId, wxAccessible** child) override;
 
   // Gets the number of children.
   wxAccStatus GetChildCount(int* childCount) override;
 
   // Gets the default action for this object (0) or > 0 (the action for a child).
   // Return wxACC_OK even if there is no action. actionName is the action, or the empty
   // string if there is no action.
   // The retrieved string describes the action that is performed on an object,
   // not what the object does as a result. For example, a toolbar button that prints
   // a document has a default action of "Press" rather than "Prints the current document."
   wxAccStatus GetDefaultAction(int childId, wxString *actionName) override;
 
   // Returns the description for this object or a child.
   wxAccStatus GetDescription(int childId, wxString *description) override;
 
   // Gets the window with the keyboard focus.
   // If childId is 0 and child is NULL, no object in
   // this subhierarchy has the focus.
   // If this object has the focus, child should be 'this'.
   wxAccStatus GetFocus(int *childId, wxAccessible **child) override;
 
   // Returns help text for this object or a child, similar to tooltip text.
   wxAccStatus GetHelpText(int childId, wxString *helpText) override;
 
   // Returns the keyboard shortcut for this object or child.
   // Return e.g. ALT+K
   wxAccStatus GetKeyboardShortcut(int childId, wxString *shortcut) override;
 
   // Returns the rectangle for this object (id = 0) or a child element (id > 0).
   // rect is in screen coordinates.
   wxAccStatus GetLocation(wxRect& rect, int elementId) override;
 
   // Gets the name of the specified object.
   wxAccStatus GetName(int childId, wxString *name) override;
 
   // Returns a role constant.
   wxAccStatus GetRole(int childId, wxAccRole *role) override;
 
   // Gets a variant representing the selected children
   // of this object.
   // Acceptable values:
   // - a null variant (IsNull() returns TRUE)
   // - a list variant (GetType() == wxT("list"))
   // - an integer representing the selected child element,
   //   or 0 if this object is selected (GetType() == wxT("long"))
   // - a "void*" pointer to a wxAccessible child object
   wxAccStatus GetSelections(wxVariant *selections) override;
 
   // Returns a state constant.
   wxAccStatus GetState(int childId, long* state) override;
 
   // Returns a localized string representing the value for the object
   // or child.
   wxAccStatus GetValue(int childId, wxString* strValue) override;
 
};
 
#endif // wxUSE_ACCESSIBILITY
 
class AUDACITY_DLL_API AButton : public wxWindow {
   friend class AButtonAx;
   class Listener;
 
public:
 
   enum Type
   {
      TextButton,
      ImageButton,
      FrameButton
   };
 
   AButton(wxWindow* parent = nullptr,
      wxWindowID id = wxID_ANY,
      const wxPoint& pos = wxDefaultPosition,
      const wxSize& size = wxDefaultSize,
      bool toggle = false);
 
    // Construct button, specifying images (button up, highlight, button down,
    // and disabled) for the default state
   AButton(wxWindow * parent,
           wxWindowID id,
           const wxPoint & pos,
           const wxSize & size,
           const wxImage& up,
           const wxImage& over,
           const wxImage& down,
           const wxImage& overDown,
           const wxImage& dis,
           bool toggle);
 
   virtual ~ AButton();
 
   void SetButtonType(Type type);
 
   // hide the inherited function that takes naked wxString:
   void SetToolTip(const TranslatableString &toolTip);
   
   // hide the inherited function that takes naked wxString:
   void SetLabel(const TranslatableString &label);
 
   bool AcceptsFocus() const override { return s_AcceptsFocus; }
   bool AcceptsFocusFromKeyboard() const override { return mEnabled; }
 
   void SetFocusFromKbd() override;
 
   //Same as SetAlternateImages(0, ...);
   void SetImages(const wxImage& up,
                    const wxImage& over,
                    const wxImage& down,
                    const wxImage& overDown,
                    const wxImage& dis);
 
   // Associate a set of four images (button up, highlight, button down,
   // disabled) with one nondefault state of the button
   void SetAlternateImages(unsigned idx,
                                   const wxImage& up,
                                   const wxImage& over,
                                   const wxImage& down,
                                   const wxImage& overDown,
                                   const wxImage& dis);
 
   void SetIcon(const wxImage& icon);
 
   // Choose state of the button
   void SetAlternateIdx(unsigned idx);
 
   // Make the button change appearance with the modifier keys, no matter
   // where the mouse is:
   // Use state 2 when CTRL is down, else 1 when SHIFT is down, else 0
   void FollowModifierKeys();
 
   void SetFocusRect(const wxRect & r);
 
   bool IsEnabled() const { return mEnabled; }
   void Disable();
   void Enable();
   void SetEnabled(bool state) {
      state ? Enable() : Disable();
   }
 
   void PushDown();
   void PopUp();
 
   void OnErase(wxEraseEvent & event);
   void OnPaint(wxPaintEvent & event);
   void OnSize(wxSizeEvent & event);
   void OnMouseEvent(wxMouseEvent & event);
 
   // Update the status bar message if the pointer is in the button.
   // Else do nothing.
   void UpdateStatus();
 
   void OnCaptureLost(wxMouseCaptureLostEvent & event);
   void OnKeyDown(wxKeyEvent & event);
   void OnSetFocus(wxFocusEvent & event);
   void OnKillFocus(wxFocusEvent & event);
   void OnCharHook(wxKeyEvent& event);
 
   bool WasShiftDown(); // returns true if shift was held down
                                // the last time the button was clicked
   bool WasControlDown(); // returns true if control was held down
                                  // the last time the button was clicked
   bool IsDown(){ return mButtonIsDown;}
 
   // Double click is detected, but not automatically cleared.
   bool IsDoubleClicked() const { return mIsDoubleClicked; }
   void ClearDoubleClicked() { mIsDoubleClicked = false; }
 
   void SetButtonToggles( bool toggler ){ mToggle = toggler;}
   bool IsToggle() const noexcept;
   // When click is over and mouse has moved away, a normal button
   // should pop up.
   void InteractionOver(){ if( !mToggle ) PopUp();}
   void Toggle(){ mButtonIsDown ? PopUp() : PushDown();}
   void Click();
   void SetShift(bool shift);
   void SetControl(bool control);
 
   wxSize DoGetBestClientSize() const override;
 
   enum AButtonState {
      AButtonUp,
      AButtonOver,
      AButtonDown,
      AButtonOverDown,
      AButtonDis,
 
      AButtonStateCount
   };
 
   AButtonState GetState();
 
   void UseDisabledAsDownHiliteImage(bool flag);
 
 private:
   static bool s_AcceptsFocus;
   struct Resetter { void operator () (bool *p) const { if(p) *p = false; } };
   using TempAllowFocus = std::unique_ptr<bool, Resetter>;
 
 public:
   static TempAllowFocus TemporarilyAllowFocus();
 
 private:
 
   bool HasAlternateImages(unsigned idx) const;
 
   void Init(wxWindow* parent, wxWindowID id, const wxPoint& pos, const wxSize& size, bool toggle);
 
   unsigned mAlternateIdx{0};
   bool mToggle{false};   // This bool, if true, makes the button able to
                   // process events when it is in the down state, and
                   // moving to the opposite state when it is clicked.
                   // It is used for the Pause button, and possibly
                   // others.  If false, it (should) behave just like
                   // a standard button.
 
   bool mWasShiftDown {false};
   bool mWasControlDown {false};
 
   bool mCursorIsInWindow{false};
   bool mButtonIsDown{false};
   bool mIsClicking{false};
   bool mEnabled{true};
   bool mUseDisabledAsDownHiliteImage{false};
   bool mIsDoubleClicked{false};
 
   wxImage mIcon;
   std::vector<std::array<wxImage, AButtonStateCount>> mImages;
 
   wxRect mFocusRect;
   bool mForceFocusRect{false};
 
   std::unique_ptr<Listener> mListener;
 
   Type mType{ImageButton};
 
public:
 
    DECLARE_EVENT_TABLE()
};
 
#endif