Add RefreshDeferrer

src/Cutter.pro

@@ -219,7 +219,8 @@ SOURCES += \
     widgets/ComboQuickFilterView.cpp \
     dialogs/HexdumpRangeDialog.cpp \
     common/QtResImporter.cpp \
-    widgets/CutterSeekable.cpp
+    widgets/CutterSeekable.cpp \
+    common/RefreshDeferrer.cpp
 
 HEADERS  += \
     Cutter.h \
@@ -322,7 +323,8 @@ HEADERS  += \
     widgets/ComboQuickFilterView.h \
     dialogs/HexdumpRangeDialog.h \
     common/QtResImporter.h \
-    widgets/CutterSeekable.h
+    widgets/CutterSeekable.h \
+    common/RefreshDeferrer.h
 
 FORMS    += \
     dialogs/AboutDialog.ui \

src/common/RefreshDeferrer.cpp

@@ -0,0 +1,37 @@
+
+#include "RefreshDeferrer.h"
+#include "widgets/CutterDockWidget.h"
+
+RefreshDeferrer::RefreshDeferrer(RefreshDeferrerAccumulator *acc, QObject *parent) : QObject(parent),
+    acc(acc)
+{
+}
+
+RefreshDeferrer::~RefreshDeferrer()
+{
+    delete acc;
+}
+
+bool RefreshDeferrer::attemptRefresh(RefreshDeferrerParams params)
+{
+    if (dockWidget->isVisibleToUser()) {
+        return true;
+    } else {
+        dirty = true;
+        acc->accumulate(params);
+        return false;
+    }
+}
+
+void RefreshDeferrer::registerFor(CutterDockWidget *dockWidget)
+{
+    this->dockWidget = dockWidget;
+    connect(dockWidget, &CutterDockWidget::becameVisibleToUser, this, [this]() {
+        if(dirty) {
+            emit refreshNow(acc->result());
+            acc->clear();
+            dirty = false;
+        }
+    });
+}
+

src/common/RefreshDeferrer.h

@@ -0,0 +1,83 @@
+
+#ifndef REFRESHDEFERRER_H
+#define REFRESHDEFERRER_H
+
+#include <QObject>
+
+class CutterDockWidget;
+class RefreshDeferrer;
+
+using RefreshDeferrerParams = void *;
+using RefreshDeferrerParamsResult = void *;
+
+class RefreshDeferrerAccumulator
+{
+    friend class RefreshDeferrer;
+
+public:
+    virtual ~RefreshDeferrerAccumulator() = default;
+
+protected:
+    virtual void accumulate(RefreshDeferrerParams params) =0;
+    virtual void ignoreParams(RefreshDeferrerParams params) =0;
+    virtual void clear() =0;
+    virtual RefreshDeferrerParamsResult result() =0;
+};
+
+template<class T>
+class ReplacingRefreshDeferrerAccumulator: public RefreshDeferrerAccumulator
+{
+private:
+    T *value = nullptr;
+
+public:
+    ~ReplacingRefreshDeferrerAccumulator() override
+    {
+        delete value;
+    }
+
+protected:
+    void accumulate(RefreshDeferrerParams params) override
+    {
+        delete value;
+        value = static_cast<T *>(params);
+    }
+
+    void ignoreParams(RefreshDeferrerParams params) override
+    {
+        delete static_cast<T *>(params);
+    }
+
+    void clear() override
+    {
+        delete value;
+        value = nullptr;
+    }
+
+    virtual RefreshDeferrerParamsResult result() override
+    {
+        return value;
+    }
+};
+
+class RefreshDeferrer : public QObject
+{
+    Q_OBJECT
+
+private:
+    CutterDockWidget *dockWidget = nullptr;
+    RefreshDeferrerAccumulator *acc;
+    bool dirty = false;
+
+public:
+    RefreshDeferrer(RefreshDeferrerAccumulator *acc, QObject *parent = nullptr);
+    virtual ~RefreshDeferrer();
+
+    bool attemptRefresh(RefreshDeferrerParams params);
+    void registerFor(CutterDockWidget *dockWidget);
+
+signals:
+    void refreshNow(RefreshDeferrerParamsResult paramsResult);
+};
+
+#endif //REFRESHDEFERRER_H

src/widgets/CutterDockWidget.cpp

@@ -12,10 +12,9 @@ CutterDockWidget::CutterDockWidget(MainWindow *main, QAction *action) :
         connect(action, &QAction::triggered, this, &CutterDockWidget::toggleDockWidget);
     }
 
-    isVisibleToUserCurrent = false;
-
     // Install event filter to catch redraw widgets when needed
     installEventFilter(this);
+    updateIsVisibleToUser();
 }
 
 CutterDockWidget::~CutterDockWidget() {}

src/widgets/CutterDockWidget.h

@@ -13,6 +13,7 @@ public:
     explicit CutterDockWidget(MainWindow *main, QAction *action = nullptr);
     ~CutterDockWidget() override;
     bool eventFilter(QObject *object, QEvent *event) override;
+    bool isVisibleToUser()      { return isVisibleToUserCurrent; }
 
 public slots:
     void toggleDockWidget(bool show);
@@ -28,7 +29,6 @@ private:
 
 protected:
     void closeEvent(QCloseEvent *event) override;
-    bool isVisibleToUser()      { return isVisibleToUserCurrent; }
 };
 
 #endif // CUTTERWIDGET_H

src/widgets/DisassemblyWidget.cpp

@@ -42,6 +42,7 @@ DisassemblyWidget::DisassemblyWidget(MainWindow *main, QAction *action)
     ,   mDisasScrollArea(new DisassemblyScrollArea(this))
     ,   mDisasTextEdit(new DisassemblyTextEdit(this))
     ,   seekable(new CutterSeekable(this))
+    ,   disasmRefresh(new ReplacingRefreshDeferrerAccumulator<RVA>)
 {
     topOffset = bottomOffset = RVA_INVALID;
     cursorLineOffset = 0;
@@ -63,6 +64,13 @@ DisassemblyWidget::DisassemblyWidget(MainWindow *main, QAction *action)
     setupFonts();
     setupColors();
 
+    disasmRefresh.registerFor(this);
+    connect(&disasmRefresh, &RefreshDeferrer::refreshNow, this, [this](RefreshDeferrerParamsResult paramsResult) {
+        printf("got refresh now!\n");
+        RVA *offset = static_cast<RVA *>(paramsResult);
+        refreshDisasm(*offset);
+    });
+
     maxLines = 0;
     updateMaxLines();
 
@@ -175,13 +183,6 @@ DisassemblyWidget::DisassemblyWidget(MainWindow *main, QAction *action)
     ADD_SHORTCUT(QKeySequence(Qt::CTRL + Qt::Key_Plus), &DisassemblyWidget::zoomIn)
     ADD_SHORTCUT(QKeySequence(Qt::CTRL + Qt::Key_Minus), &DisassemblyWidget::zoomOut)
 #undef ADD_SHORTCUT
-
-    connect(this, &CutterDockWidget::becameVisibleToUser, this, [this]() {
-        printf("ooh! we became visible!\n");
-        if (disasmDirty) {
-            refreshDisasm(disasmDirtyOffset);
-        }
-    });
 }
 
 void DisassemblyWidget::toggleSync()
@@ -202,15 +203,11 @@ QWidget *DisassemblyWidget::getTextWidget()
 
 void DisassemblyWidget::refreshDisasm(RVA offset)
 {
-    if (!isVisibleToUser()) {
-        printf("setting dirty\n");
-        disasmDirty = true;
-        disasmDirtyOffset = offset;
+    if(!disasmRefresh.attemptRefresh(new RVA(offset))) {
+        printf("we tried to refresh, but shouldn't yet.\n");
         return;
-    } else {
-        printf("now refreshing\n");
-        disasmDirty = false;
     }
+    printf("ok, actually refreshing now!\n");
 
     if (offset != RVA_INVALID) {
         topOffset = offset;

src/widgets/DisassemblyWidget.h

@@ -4,6 +4,8 @@
 #include "Cutter.h"
 #include "CutterDockWidget.h"
 #include "CutterSeekable.h"
+#include "common/RefreshDeferrer.h"
+
 #include <QTextEdit>
 #include <QPlainTextEdit>
 #include <QShortcut>
@@ -57,8 +59,7 @@ private:
     int cursorLineOffset;
     bool seekFromCursor;
 
-    bool disasmDirty = false;
-    RVA disasmDirtyOffset = RVA_INVALID;
+    RefreshDeferrer disasmRefresh;
 
     RVA readCurrentDisassemblyOffset();
     RVA readDisassemblyOffset(QTextCursor tc);