From 3ba25dd33d02a62e5e69472c2436fff376d22a63 Mon Sep 17 00:00:00 2001
From: apa420 <17131426+apa420@users.noreply.github.com>
Date: Sun, 13 Apr 2025 10:34:25 +0000
Subject: [PATCH] Feat: (Linux) Themes allow transparency on chat windows
 background (#6137)

---
 CHANGELOG.md                          |  1 +
 src/widgets/Window.cpp                |  6 +++++
 src/widgets/splits/SplitContainer.cpp | 33 ++++++++++++++++++++-------
 src/widgets/splits/SplitContainer.hpp |  1 +
 4 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77f4e0eb..702187ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 - Minor: Add an option for the reduced opacity of message history. (#6121)
 - Minor: Make paused chat indicator more visible, and fix its zoom behavior. (#6123)
 - Minor: Added WebSocket API for plugins. (#6076)
+- Minor: Allow for themes to set transparent values for window background on Linux. (#6137)
 - Minor: Popup overlay now only draws an outline when being interacted with. (#6140)
 - Bugfix: Don't create native messaging manifest file if browser directory doesn't exist. (#6116)
 - Bugfix: Fixed scrolling now working on inputs in the settings. (#6128)
diff --git a/src/widgets/Window.cpp b/src/widgets/Window.cpp
index 92b85c72..bac800b5 100644
--- a/src/widgets/Window.cpp
+++ b/src/widgets/Window.cpp
@@ -75,6 +75,12 @@ Window::Window(WindowType type, QWidget *parent)
     if (type == WindowType::Main)
     {
         this->resize(int(600 * this->scale()), int(500 * this->scale()));
+#ifdef Q_OS_LINUX
+        if (this->theme->window.background.alpha() != 255)
+        {
+            this->setAttribute(Qt::WA_TranslucentBackground);
+        }
+#endif
     }
     else
     {
diff --git a/src/widgets/splits/SplitContainer.cpp b/src/widgets/splits/SplitContainer.cpp
index 430098f0..4049e300 100644
--- a/src/widgets/splits/SplitContainer.cpp
+++ b/src/widgets/splits/SplitContainer.cpp
@@ -22,6 +22,7 @@
 #include <QJsonObject>
 #include <QMimeData>
 #include <QPainter>
+#include <QPainterPath>
 
 #include <algorithm>
 
@@ -613,6 +614,29 @@ void SplitContainer::mouseReleaseEvent(QMouseEvent *event)
     }
 }
 
+void SplitContainer::paintSplitBorder(Node *node, QPainter *painter)
+{
+    switch (node->type_)
+    {
+        case Node::Type::Split: {
+            QRectF nodeRect = node->geometry_;
+            painter->setPen(this->theme->tabs.dividerLine);
+            QPainterPath p = QPainterPath();
+            p.addRect(nodeRect);
+            painter->strokePath(p, painter->pen());
+        }
+        break;
+        case Node::Type::VerticalContainer:
+        case Node::Type::HorizontalContainer: {
+            for (std::unique_ptr<Node> &child : node->children_)
+            {
+                paintSplitBorder(child.get(), painter);
+            }
+        }
+        break;
+    }
+}
+
 void SplitContainer::paintEvent(QPaintEvent * /*event*/)
 {
     QPainter painter(this);
@@ -643,14 +667,7 @@ void SplitContainer::paintEvent(QPaintEvent * /*event*/)
     }
     else
     {
-        if (getApp()->getThemes()->isLightTheme())
-        {
-            painter.fillRect(rect(), QColor("#999"));
-        }
-        else
-        {
-            painter.fillRect(rect(), QColor("#555"));
-        }
+        this->paintSplitBorder(this->getBaseNode(), &painter);
     }
 
     for (DropRect &dropRect : this->dropRects_)
diff --git a/src/widgets/splits/SplitContainer.hpp b/src/widgets/splits/SplitContainer.hpp
index 9e4a6cc7..933be935 100644
--- a/src/widgets/splits/SplitContainer.hpp
+++ b/src/widgets/splits/SplitContainer.hpp
@@ -246,6 +246,7 @@ private:
     void selectSplitRecursive(Node *node, SplitDirection direction);
     void focusSplitRecursive(Node *node);
     void setPreferedTargetRecursive(Node *node);
+    void paintSplitBorder(Node *node, QPainter *painter);
 
     void addSplit(Split *split);