Upgrade WX to r74856, mainly to support @2x.

Externals/wxWidgets3/include/wx/modalhook.h

@@ -0,0 +1,104 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/modalhook.h
+// Purpose:     Allows to hook into showing modal dialogs.
+// Author:      Vadim Zeitlin
+// Created:     2013-05-19
+// Copyright:   (c) 2013 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MODALHOOK_H_
+#define _WX_MODALHOOK_H_
+
+#include "wx/vector.h"
+
+class WXDLLIMPEXP_FWD_CORE wxDialog;
+
+// ----------------------------------------------------------------------------
+// Class allowing to be notified about any modal dialog calls.
+// ----------------------------------------------------------------------------
+
+// To be notified about entering and exiting modal dialogs and possibly to
+// replace them with something else (e.g. just return a predefined value for
+// testing), define an object of this class, override its Enter() and
+// possibly Exit() methods and call Register() on it.
+class WXDLLIMPEXP_CORE wxModalDialogHook
+{
+public:
+    // Default ctor doesn't do anything, call Register() to activate the hook.
+    wxModalDialogHook() { }
+
+    // Dtor unregisters the hook if it had been registered.
+    virtual ~wxModalDialogHook() { DoUnregister(); }
+
+    // Register this hook as being active, i.e. its Enter() and Exit() methods
+    // will be called.
+    //
+    // Notice that the order of registration matters: the last hook registered
+    // is called first, and if its Enter() returns something != wxID_NONE, the
+    // subsequent hooks are skipped.
+    void Register();
+
+    // Unregister this hook. Notice that is done automatically from the dtor.
+    void Unregister();
+
+    // Called from wxWidgets code before showing any modal dialogs and calls
+    // Enter() for every registered hook.
+    static int CallEnter(wxDialog* dialog);
+
+    // Called from wxWidgets code after dismissing the dialog and calls Exit()
+    // for every registered hook.
+    static void CallExit(wxDialog* dialog);
+
+protected:
+    // Called by wxWidgets before showing any modal dialogs, override this to
+    // be notified about this and return anything but wxID_NONE to skip showing
+    // the modal dialog entirely and just return the specified result.
+    virtual int Enter(wxDialog* dialog) = 0;
+
+    // Called by wxWidgets after dismissing the modal dialog. Notice that it
+    // won't be called if Enter() hadn't been.
+    virtual void Exit(wxDialog* WXUNUSED(dialog)) { }
+
+private:
+    // Unregister the given hook, return true if it was done or false if the
+    // hook wasn't found.
+    bool DoUnregister();
+
+    // All the hooks in reverse registration order (i.e. in call order).
+    typedef wxVector<wxModalDialogHook*> Hooks;
+    static Hooks ms_hooks;
+
+    wxDECLARE_NO_COPY_CLASS(wxModalDialogHook);
+};
+
+// Helper object used by WX_MODAL_DIALOG_HOOK below to ensure that CallExit()
+// is called on scope exit.
+class wxModalDialogHookExitGuard
+{
+public:
+    wxEXPLICIT wxModalDialogHookExitGuard(wxDialog* dialog)
+        : m_dialog(dialog)
+    {
+    }
+
+    ~wxModalDialogHookExitGuard()
+    {
+        wxModalDialogHook::CallExit(m_dialog);
+    }
+
+private:
+    wxDialog* const m_dialog;
+
+    wxDECLARE_NO_COPY_CLASS(wxModalDialogHookExitGuard);
+};
+
+// This macro needs to be used at the top of every implementation of
+// ShowModal() in order for wxModalDialogHook to work.
+#define WX_HOOK_MODAL_DIALOG()                                                \
+    const int modalDialogHookRC = wxModalDialogHook::CallEnter(this);         \
+    if ( modalDialogHookRC != wxID_NONE )                                     \
+        return modalDialogHookRC;                                             \
+    wxModalDialogHookExitGuard modalDialogHookExit(this)
+
+#endif // _WX_MODALHOOK_H_