DolphinQt: A Ubiquitous Signal For When Breakpoints Change

There were three distinct mechanisms for signaling breakpoint changes in DolphinQt, and the wiring had room for improvement. The behavior of these signals has been consolidated into the new `Host::PPCBreakpointsChanged` signal, which can be emitted from anywhere in DolphinQt to properly update breakpoints everywhere in DolphinQt.

This improves a few things:
- For the `CodeViewWidget` and `MemoryViewWidget`, signals no longer need to propagate through the `CodeWidget` and `MemoryWidget` (respectively) to reach their destination (incoming or outgoing).
- For the `BreakpointWidget`, by self-triggering from its own signal, it no longer must manually call `Update()` after all of the emission sites.
- For the `BranchWatchDialog`, it now has one less thing it must go through the `CodeWidget` for, which is a plus.

Source/Core/DolphinQt/Debugger/BranchWatchDialog.cpp

@@ -1156,8 +1156,7 @@ void BranchWatchDialog::SetBreakpoints(bool break_on_hit, bool log_on_hit) const
     const u32 address = m_table_proxy->data(index, UserRole::ClickRole).value<u32>();
     breakpoints.Add(address, break_on_hit, log_on_hit, {});
   }
-  emit m_code_widget->BreakpointsChanged();
-  m_code_widget->Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BranchWatchDialog::SetBreakpointMenuActionsIcons() const

Source/Core/DolphinQt/Debugger/BreakpointWidget.cpp

@@ -28,6 +28,7 @@
 
 #include "DolphinQt/Debugger/BreakpointDialog.h"
 #include "DolphinQt/Debugger/MemoryWidget.h"
+#include "DolphinQt/Host.h"
 #include "DolphinQt/QtUtils/SetWindowDecorations.h"
 #include "DolphinQt/Resources.h"
 #include "DolphinQt/Settings.h"
@@ -130,6 +131,8 @@ BreakpointWidget::BreakpointWidget(QWidget* parent)
     Update();
   });
 
+  connect(Host::GetInstance(), &Host::PPCBreakpointsChanged, this, &BreakpointWidget::Update);
+
   UpdateIcons();
 }
 
@@ -222,8 +225,7 @@ void BreakpointWidget::OnClicked(QTableWidgetItem* item)
     else
       m_system.GetPowerPC().GetBreakPoints().ToggleEnable(address);
 
-    emit BreakpointsChanged();
-    Update();
+    emit Host::GetInstance()->PPCBreakpointsChanged();
     return;
   }
 
@@ -431,8 +433,7 @@ void BreakpointWidget::OnClear()
 
   m_table->setRowCount(0);
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BreakpointWidget::OnNewBreakpoint()
@@ -462,8 +463,7 @@ void BreakpointWidget::OnEditBreakpoint(u32 address, bool is_instruction_bp)
     dialog->exec();
   }
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BreakpointWidget::OnLoad()
@@ -492,8 +492,7 @@ void BreakpointWidget::OnLoad()
     memchecks.AddFromStrings(new_mcs);
   }
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BreakpointWidget::OnSave()
@@ -532,8 +531,7 @@ void BreakpointWidget::OnContextMenu(const QPoint& pos)
     menu->addAction(tr("Edit..."), [this, bp_address] { OnEditBreakpoint(bp_address, true); });
     menu->addAction(tr("Delete"), [this, &bp_address]() {
       m_system.GetPowerPC().GetBreakPoints().Remove(bp_address);
-      emit BreakpointsChanged();
-      Update();
+      emit Host::GetInstance()->PPCBreakpointsChanged();
     });
   }
   else
@@ -550,8 +548,7 @@ void BreakpointWidget::OnContextMenu(const QPoint& pos)
     menu->addAction(tr("Delete"), [this, &bp_address]() {
       const QSignalBlocker blocker(Settings::Instance());
       m_system.GetPowerPC().GetMemChecks().Remove(bp_address);
-      emit BreakpointsChanged();
-      Update();
+      emit Host::GetInstance()->PPCBreakpointsChanged();
     });
   }
 
@@ -615,8 +612,7 @@ void BreakpointWidget::AddBP(u32 addr, bool break_on_hit, bool log_on_hit, const
       addr, break_on_hit, log_on_hit,
       !condition.isEmpty() ? Expression::TryParse(condition.toUtf8().constData()) : std::nullopt);
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BreakpointWidget::EditBreakpoint(u32 address, int edit, std::optional<QString> string)
@@ -650,8 +646,7 @@ void BreakpointWidget::EditBreakpoint(u32 address, int edit, std::optional<QStri
   m_system.GetPowerPC().GetBreakPoints().Remove(address);
   m_system.GetPowerPC().GetBreakPoints().Add(std::move(bp));
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BreakpointWidget::AddAddressMBP(u32 addr, bool on_read, bool on_write, bool do_log,
@@ -673,8 +668,7 @@ void BreakpointWidget::AddAddressMBP(u32 addr, bool on_read, bool on_write, bool
     m_system.GetPowerPC().GetMemChecks().Add(std::move(check));
   }
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BreakpointWidget::AddRangedMBP(u32 from, u32 to, bool on_read, bool on_write, bool do_log,
@@ -696,8 +690,7 @@ void BreakpointWidget::AddRangedMBP(u32 from, u32 to, bool on_read, bool on_writ
     m_system.GetPowerPC().GetMemChecks().Add(std::move(check));
   }
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void BreakpointWidget::EditMBP(u32 address, int edit, std::optional<QString> string)
@@ -754,6 +747,5 @@ void BreakpointWidget::EditMBP(u32 address, int edit, std::optional<QString> str
       m_system.GetPowerPC().GetMemChecks().Remove(address);
   }
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }

Source/Core/DolphinQt/Debugger/BreakpointWidget.h

@@ -43,7 +43,6 @@ public:
   void Update();
 
 signals:
-  void BreakpointsChanged();
   void ShowCode(u32 address);
   void ShowMemory(u32 address);
 

Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp

@@ -188,6 +188,8 @@ CodeViewWidget::CodeViewWidget()
   });
   connect(Host::GetInstance(), &Host::PPCSymbolsChanged, this,
           qOverload<>(&CodeViewWidget::Update));
+  connect(Host::GetInstance(), &Host::PPCBreakpointsChanged, this,
+          qOverload<>(&CodeViewWidget::Update));
 
   connect(&Settings::Instance(), &Settings::ThemeChanged, this,
           qOverload<>(&CodeViewWidget::Update));
@@ -1139,16 +1141,14 @@ void CodeViewWidget::ToggleBreakpoint()
 {
   m_system.GetPowerPC().GetBreakPoints().ToggleBreakPoint(GetContextAddress());
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void CodeViewWidget::AddBreakpoint()
 {
   m_system.GetPowerPC().GetBreakPoints().Add(GetContextAddress());
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 u32 CodeViewWidget::GetContextAddress() const

Source/Core/DolphinQt/Debugger/CodeViewWidget.h

@@ -57,7 +57,6 @@ public:
 signals:
   void RequestPPCComparison(u32 addr);
   void ShowMemory(u32 address);
-  void BreakpointsChanged();
   void UpdateCodeWidget();
 
 private:

Source/Core/DolphinQt/Debugger/CodeWidget.cpp

@@ -190,8 +190,6 @@ void CodeWidget::ConnectWidgets()
           &CodeWidget::OnSelectFunctionCallers);
 
   connect(Host::GetInstance(), &Host::PPCSymbolsChanged, this, &CodeWidget::OnPPCSymbolsChanged);
-  connect(m_code_view, &CodeViewWidget::BreakpointsChanged, this,
-          [this] { emit BreakpointsChanged(); });
   connect(m_code_view, &CodeViewWidget::UpdateCodeWidget, this, &CodeWidget::Update);
 
   connect(m_code_view, &CodeViewWidget::RequestPPCComparison, this,

Source/Core/DolphinQt/Debugger/CodeWidget.h

@@ -50,7 +50,6 @@ public:
   void Update();
   void UpdateSymbols();
 signals:
-  void BreakpointsChanged();
   void RequestPPCComparison(u32 addr);
   void ShowMemory(u32 address);
 

Source/Core/DolphinQt/Debugger/MemoryViewWidget.cpp

@@ -200,6 +200,8 @@ MemoryViewWidget::MemoryViewWidget(Core::System& system, QWidget* parent)
   connect(&Settings::Instance(), &Settings::DebugFontChanged, this, &MemoryViewWidget::UpdateFont);
   connect(&Settings::Instance(), &Settings::EmulationStateChanged, this,
           qOverload<>(&MemoryViewWidget::UpdateColumns));
+  connect(Host::GetInstance(), &Host::PPCBreakpointsChanged, this,
+          qOverload<>(&MemoryViewWidget::Update));
   connect(Host::GetInstance(), &Host::UpdateDisasmDialog, this,
           qOverload<>(&MemoryViewWidget::UpdateColumns));
   connect(&Settings::Instance(), &Settings::ThemeChanged, this, &MemoryViewWidget::Update);
@@ -840,8 +842,7 @@ void MemoryViewWidget::ToggleBreakpoint(u32 addr, bool row)
     }
   }
 
-  emit BreakpointsChanged();
-  Update();
+  emit Host::GetInstance()->PPCBreakpointsChanged();
 }
 
 void MemoryViewWidget::OnCopyAddress(u32 addr)

Source/Core/DolphinQt/Debugger/MemoryViewWidget.h

@@ -72,7 +72,6 @@ public:
   void SetBPLoggingEnabled(bool enabled);
 
 signals:
-  void BreakpointsChanged();
   void ShowCode(u32 address);
   void RequestWatch(QString name, u32 address);
 

Source/Core/DolphinQt/Debugger/MemoryWidget.cpp

@@ -333,8 +333,6 @@ void MemoryWidget::ConnectWidgets()
 
   connect(m_base_check, &QCheckBox::toggled, this, &MemoryWidget::ValidateAndPreviewInputValue);
   connect(m_bp_log_check, &QCheckBox::toggled, this, &MemoryWidget::OnBPLogChanged);
-  connect(m_memory_view, &MemoryViewWidget::BreakpointsChanged, this,
-          &MemoryWidget::BreakpointsChanged);
   connect(m_memory_view, &MemoryViewWidget::ShowCode, this, &MemoryWidget::ShowCode);
   connect(m_memory_view, &MemoryViewWidget::RequestWatch, this, &MemoryWidget::RequestWatch);
 }

Source/Core/DolphinQt/Debugger/MemoryWidget.h

@@ -36,7 +36,6 @@ public:
   void SetAddress(u32 address);
   void Update();
 signals:
-  void BreakpointsChanged();
   void ShowCode(u32 address);
   void RequestWatch(QString name, u32 address);
 

Source/Core/DolphinQt/Host.h

@@ -41,6 +41,7 @@ signals:
   void RequestRenderSize(int w, int h);
   void UpdateDisasmDialog();
   void PPCSymbolsChanged();
+  void PPCBreakpointsChanged();
 
 private:
   Host();

Source/Core/DolphinQt/MainWindow.cpp

@@ -496,21 +496,13 @@ void MainWindow::CreateComponents()
   connect(m_thread_widget, &ThreadWidget::RequestViewInMemory, request_view_in_memory);
   connect(m_thread_widget, &ThreadWidget::RequestViewInCode, request_view_in_code);
 
-  connect(m_code_widget, &CodeWidget::BreakpointsChanged, m_breakpoint_widget,
-          &BreakpointWidget::Update);
   connect(m_code_widget, &CodeWidget::RequestPPCComparison, m_jit_widget, &JITWidget::Compare);
   connect(m_code_widget, &CodeWidget::ShowMemory, m_memory_widget, &MemoryWidget::SetAddress);
-  connect(m_memory_widget, &MemoryWidget::BreakpointsChanged, m_breakpoint_widget,
-          &BreakpointWidget::Update);
   connect(m_memory_widget, &MemoryWidget::ShowCode, m_code_widget, [this](u32 address) {
     m_code_widget->SetAddress(address, CodeViewWidget::SetAddressUpdate::WithDetailedUpdate);
   });
   connect(m_memory_widget, &MemoryWidget::RequestWatch, request_watch);
 
-  connect(m_breakpoint_widget, &BreakpointWidget::BreakpointsChanged, m_code_widget,
-          &CodeWidget::Update);
-  connect(m_breakpoint_widget, &BreakpointWidget::BreakpointsChanged, m_memory_widget,
-          &MemoryWidget::Update);
   connect(m_breakpoint_widget, &BreakpointWidget::ShowCode, [this](u32 address) {
     if (Core::GetState(Core::System::GetInstance()) == Core::State::Paused)
       m_code_widget->SetAddress(address, CodeViewWidget::SetAddressUpdate::WithDetailedUpdate);