fix: get rid of duplicate scale events (#5404)

CHANGELOG.md

@@ -12,6 +12,7 @@
 - Dev: Add doxygen build target. (#5377)
 - Dev: Make printing of strings in tests easier. (#5379)
 - Dev: Refactor and document `Scrollbar`. (#5334, #5393)
+- Dev: Reduced the amount of scale events. (#5404)
 
 ## 2.5.1
 

src/widgets/BaseWidget.cpp

@@ -54,7 +54,11 @@ float BaseWidget::scale() const
 
 void BaseWidget::setScale(float value)
 {
-    // update scale value
+    if (this->scale_ == value)
+    {
+        return;
+    }
+
     this->scale_ = value;
 
     this->scaleChangedEvent(this->scale());

src/widgets/BaseWindow.cpp

@@ -227,7 +227,6 @@ BaseWindow::BaseWindow(FlagsEnum<Flags> _flags, QWidget *parent)
         [this]() {
             postToThread([this] {
                 this->updateScale();
-                this->updateScale();
             });
         },
         this->connections_, false);

src/widgets/Notebook.cpp

@@ -593,6 +593,12 @@ void Notebook::showTabVisibilityInfoPopup()
 
 void Notebook::refresh()
 {
+    if (this->refreshPaused_)
+    {
+        this->refreshRequested_ = true;
+        return;
+    }
+
     this->performLayout();
     this->updateTabVisibility();
 }
@@ -652,13 +658,20 @@ void Notebook::resizeAddButton()
     this->addButton_->setFixedSize(h, h);
 }
 
-void Notebook::scaleChangedEvent(float)
+void Notebook::scaleChangedEvent(float /*scale*/)
 {
     this->resizeAddButton();
+    this->refreshPaused_ = true;
+    this->refreshRequested_ = false;
     for (auto &i : this->items_)
     {
         i.tab->updateSize();
     }
+    this->refreshPaused_ = false;
+    if (this->refreshRequested_)
+    {
+        this->refresh();
+    }
 }
 
 void Notebook::resizeEvent(QResizeEvent *)

src/widgets/Notebook.hpp

@@ -193,7 +193,12 @@ private:
     bool showAddButton_ = false;
     int lineOffset_ = 20;
     bool lockNotebookLayout_ = false;
+
+    bool refreshPaused_ = false;
+    bool refreshRequested_ = false;
+
     NotebookTabLocation tabLocation_ = NotebookTabLocation::Top;
+
     QAction *lockNotebookLayoutAction_;
     QAction *showTabsAction_;
     QAction *toggleTopMostAction_;

src/widgets/dialogs/SettingsDialog.cpp

@@ -397,9 +397,9 @@ void SettingsDialog::refresh()
     }
 }
 
-void SettingsDialog::scaleChangedEvent(float newDpi)
+void SettingsDialog::scaleChangedEvent(float newScale)
 {
-    assert(newDpi == 1.F &&
+    assert(newScale == 1.F &&
            "Scaling is disabled for the settings dialog - its scale should "
            "always be 1");
 

src/widgets/helper/NotebookTab.cpp

@@ -8,7 +8,6 @@
 #include "singletons/Settings.hpp"
 #include "singletons/Theme.hpp"
 #include "singletons/WindowManager.hpp"
-#include "util/Clamp.hpp"
 #include "util/Helpers.hpp"
 #include "widgets/dialogs/SettingsDialog.hpp"
 #include "widgets/Notebook.hpp"
@@ -25,6 +24,8 @@
 #include <QMimeData>
 #include <QPainter>
 
+#include <algorithm>
+
 namespace chatterino {
 namespace {
     // Translates the given rectangle by an amount in the direction to appear like the tab is selected.
@@ -182,10 +183,15 @@ void NotebookTab::growWidth(int width)
     }
 }
 
-int NotebookTab::normalTabWidth()
+int NotebookTab::normalTabWidth() const
+{
+    return this->normalTabWidthForHeight(this->height());
+}
+
+int NotebookTab::normalTabWidthForHeight(int height) const
 {
     float scale = this->scale();
-    int width;
+    int width = 0;
 
     QFontMetrics metrics =
         getIApp()->getFonts()->getFontMetrics(FontStyle::UiTabs, scale);
@@ -199,13 +205,13 @@ int NotebookTab::normalTabWidth()
         width = (metrics.horizontalAdvance(this->getTitle()) + int(16 * scale));
     }
 
-    if (this->height() > 150 * scale)
+    if (static_cast<float>(height) > 150 * scale)
     {
-        width = this->height();
+        width = height;
     }
     else
     {
-        width = clamp(width, this->height(), int(150 * scale));
+        width = std::clamp(width, height, static_cast<int>(150 * scale));
     }
 
     return width;
@@ -214,8 +220,8 @@ int NotebookTab::normalTabWidth()
 void NotebookTab::updateSize()
 {
     float scale = this->scale();
-    int width = this->normalTabWidth();
-    auto height = int(NOTEBOOK_TAB_HEIGHT * scale);
+    auto height = static_cast<int>(NOTEBOOK_TAB_HEIGHT * scale);
+    int width = this->normalTabWidthForHeight(height);
 
     if (width < this->growWidth_)
     {
@@ -628,13 +634,13 @@ void NotebookTab::paintEvent(QPaintEvent *)
     }
 }
 
-bool NotebookTab::hasXButton()
+bool NotebookTab::hasXButton() const
 {
     return getSettings()->showTabCloseButton &&
            this->notebook_->getAllowUserTabManagement();
 }
 
-bool NotebookTab::shouldDrawXButton()
+bool NotebookTab::shouldDrawXButton() const
 {
     return this->hasXButton() && (this->mouseOver_ || this->selected_);
 }
@@ -820,18 +826,15 @@ void NotebookTab::update()
     Button::update();
 }
 
-QRect NotebookTab::getXRect()
+QRect NotebookTab::getXRect() const
 {
     QRect rect = this->rect();
     float s = this->scale();
     int size = static_cast<int>(16 * s);
 
-    int centerAdjustment =
-        this->tabLocation_ ==
-                (NotebookTabLocation::Top ||
-                 this->tabLocation_ == NotebookTabLocation::Bottom)
-            ? (size / 3)   // slightly off true center
-            : (size / 2);  // true center
+    int centerAdjustment = this->tabLocation_ == NotebookTabLocation::Top
+                               ? (size / 3)   // slightly off true center
+                               : (size / 2);  // true center
 
     QRect xRect(rect.right() - static_cast<int>(20 * s),
                 rect.center().y() - centerAdjustment, size, size);

src/widgets/helper/NotebookTab.hpp

@@ -71,7 +71,7 @@ public:
     void hideTabXChanged();
 
     void growWidth(int width);
-    int normalTabWidth();
+    int normalTabWidth() const;
 
 protected:
     void themeChangedEvent() override;
@@ -100,11 +100,13 @@ protected:
 private:
     void showRenameDialog();
 
-    bool hasXButton();
-    bool shouldDrawXButton();
-    QRect getXRect();
+    bool hasXButton() const;
+    bool shouldDrawXButton() const;
+    QRect getXRect() const;
     void titleUpdated();
 
+    int normalTabWidthForHeight(int height) const;
+
     QPropertyAnimation positionChangedAnimation_;
     bool positionChangedAnimationRunning_ = false;
     QPoint positionAnimationDesiredPoint_;

src/widgets/splits/SplitHeader.cpp

@@ -271,6 +271,8 @@ SplitHeader::SplitHeader(Split *split)
             }
         });
     }
+
+    this->scaleChangedEvent(this->scale());
 }
 
 void SplitHeader::initializeLayout()