Qt: make the pause play button only one button

This is to avoid several issue with using 2 actions and switching between them.  This commit will instead have one action get his property changed on pause and play.

Source/Core/DolphinQt2/ToolBar.cpp

@@ -56,10 +56,7 @@ void ToolBar::OnEmulationStateChanged(Core::State state)
   m_screenshot_action->setEnabled(running);
 
   bool playing = running && state != Core::State::Paused;
-  m_play_action->setEnabled(!playing);
-  m_play_action->setVisible(!playing);
-  m_pause_action->setEnabled(playing);
-  m_pause_action->setVisible(playing);
+  UpdatePausePlayButtonState(playing);
 
   bool paused = Core::GetState() == Core::State::Paused;
   m_step_action->setEnabled(paused);
@@ -101,8 +98,8 @@ void ToolBar::MakeActions()
   m_set_pc_action = AddAction(this, tr("Set PC"), this, &ToolBar::SetPCPressed);
 
   m_open_action = AddAction(this, tr("Open"), this, &ToolBar::OpenPressed);
-  m_play_action = AddAction(this, tr("Play"), this, &ToolBar::PlayPressed);
-  m_pause_action = AddAction(this, tr("Pause"), this, &ToolBar::PausePressed);
+  m_pause_play_action = AddAction(this, tr("Play"), this, &ToolBar::PlayPressed);
+
   m_stop_action = AddAction(this, tr("Stop"), this, &ToolBar::StopPressed);
   m_fullscreen_action = AddAction(this, tr("FullScr"), this, &ToolBar::FullScreenPressed);
   m_screenshot_action = AddAction(this, tr("ScrShot"), this, &ToolBar::ScreenShotPressed);
@@ -117,10 +114,10 @@ void ToolBar::MakeActions()
   // Ensure every button has about the same width
   std::vector<QWidget*> items;
   for (const auto& action :
-       {m_open_action, m_play_action, m_pause_action, m_stop_action, m_stop_action,
-        m_fullscreen_action, m_screenshot_action, m_config_action, m_graphics_action,
-        m_controllers_action, m_step_action, m_step_over_action, m_step_out_action, m_skip_action,
-        m_show_pc_action, m_set_pc_action})
+       {m_open_action, m_pause_play_action, m_stop_action, m_stop_action, m_fullscreen_action,
+        m_screenshot_action, m_config_action, m_graphics_action, m_controllers_action,
+        m_step_action, m_step_over_action, m_step_out_action, m_skip_action, m_show_pc_action,
+        m_set_pc_action})
   {
     items.emplace_back(widgetForAction(action));
   }
@@ -134,6 +131,24 @@ void ToolBar::MakeActions()
     widget->setMinimumWidth(min_width);
 }
 
+void ToolBar::UpdatePausePlayButtonState(const bool playing_state)
+{
+  if (playing_state)
+  {
+    disconnect(m_pause_play_action, 0, 0, 0);
+    m_pause_play_action->setText(tr("Pause"));
+    m_pause_play_action->setIcon(Resources::GetScaledThemeIcon("pause"));
+    connect(m_pause_play_action, &QAction::triggered, this, &ToolBar::PausePressed);
+  }
+  else
+  {
+    disconnect(m_pause_play_action, 0, 0, 0);
+    m_pause_play_action->setText(tr("Play"));
+    m_pause_play_action->setIcon(Resources::GetScaledThemeIcon("play"));
+    connect(m_pause_play_action, &QAction::triggered, this, &ToolBar::PlayPressed);
+  }
+}
+
 void ToolBar::UpdateIcons()
 {
   m_step_action->setIcon(Resources::GetScaledThemeIcon("debugger_step_in"));
@@ -144,8 +159,14 @@ void ToolBar::UpdateIcons()
   m_set_pc_action->setIcon(Resources::GetScaledThemeIcon("debugger_show_pc"));
 
   m_open_action->setIcon(Resources::GetScaledThemeIcon("open"));
-  m_play_action->setIcon(Resources::GetScaledThemeIcon("play"));
-  m_pause_action->setIcon(Resources::GetScaledThemeIcon("pause"));
+
+  const Core::State state = Core::GetState();
+  const bool playing = state != Core::State::Uninitialized && state != Core::State::Paused;
+  if (!playing)
+    m_pause_play_action->setIcon(Resources::GetScaledThemeIcon("play"));
+  else
+    m_pause_play_action->setIcon(Resources::GetScaledThemeIcon("pause"));
+
   m_stop_action->setIcon(Resources::GetScaledThemeIcon("stop"));
   m_fullscreen_action->setIcon(Resources::GetScaledThemeIcon("fullscreen"));
   m_screenshot_action->setIcon(Resources::GetScaledThemeIcon("screenshot"));

Source/Core/DolphinQt2/ToolBar.h

@@ -46,10 +46,10 @@ class ToolBar final : public QToolBar
 
   void MakeActions();
   void UpdateIcons();
+  void UpdatePausePlayButtonState(bool playing_state);
 
   QAction* m_open_action;
-  QAction* m_play_action;
-  QAction* m_pause_action;
+  QAction* m_pause_play_action;
   QAction* m_stop_action;
   QAction* m_fullscreen_action;
   QAction* m_screenshot_action;