From e89ac584629ae5ea636bf7c3a35337b2ee08b178 Mon Sep 17 00:00:00 2001
From: Roy Qu <royqh1979@gmail.com>
Date: Mon, 24 Jan 2022 18:37:16 +0800
Subject: [PATCH] - enhancement: auto zoom ui when screen's zoom factor changed
 (windows)

---
 NEWS.md                    |  1 +
 RedPandaIDE/main.cpp       |  5 ++++-
 RedPandaIDE/mainwindow.cpp |  6 ++++++
 RedPandaIDE/mainwindow.h   |  1 +
 RedPandaIDE/utils.cpp      | 14 +++++++++++---
 RedPandaIDE/utils.h        |  2 ++
 6 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/NEWS.md b/NEWS.md
index fb5ae43d..72b933d5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -24,6 +24,7 @@ Red Panda C++ Version 0.13.3
   - fix: insert code snippets will crash, if current compiler set's include dir list is not empty and lib dir list is empty
   - fix: search around option can't be disabled
   - enhancement: show a confirm dialog when search/replace around
+  - enhancement: auto zoom ui when screen's zoom factor changed (windows)
   
 Red Panda C++ Version 0.13.2
   - fix: "delete and exit" button in the environtment / folder option page doesn't work correctly 
diff --git a/RedPandaIDE/main.cpp b/RedPandaIDE/main.cpp
index 8121bc0f..a8bf6420 100644
--- a/RedPandaIDE/main.cpp
+++ b/RedPandaIDE/main.cpp
@@ -25,6 +25,7 @@
 #include <QMessageBox>
 #include <QStringList>
 #include <QAbstractNativeEventFilter>
+#include <QDesktopWidget>
 #include <QDir>
 #include "common.h"
 #include "colorscheme.h"
@@ -60,7 +61,8 @@ bool WindowLogoutEventFilter::nativeEventFilter(const QByteArray & /*eventType*/
         }
         break;
     case WM_DPICHANGED:
-        //todo
+        setDesktopDpi(HIWORD(pMsg->wParam));
+        pMainWindow->updateDPI();
         break;
     }
     return false;
@@ -159,6 +161,7 @@ int main(int argc, char *argv[])
         //set default open folder
         QDir::setCurrent(pSettings->environment().defaultOpenFolder());
 
+        setDesktopDpi(qApp->desktop()->logicalDpiY());
 
         MainWindow mainWindow;
         pMainWindow = &mainWindow;
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index 22ce6e38..15929910 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -689,6 +689,12 @@ void MainWindow::setActiveBreakpoint(QString FileName, int Line, bool setFocus)
     }
 }
 
+void MainWindow::updateDPI()
+{
+    qDebug()<<"dpi changed!"<<desktopDpi();
+    applySettings();
+}
+
 void MainWindow::updateAppTitle()
 {
     QString appName=tr("Red Panda C++");
diff --git a/RedPandaIDE/mainwindow.h b/RedPandaIDE/mainwindow.h
index fc1f0b29..433567d8 100644
--- a/RedPandaIDE/mainwindow.h
+++ b/RedPandaIDE/mainwindow.h
@@ -215,6 +215,7 @@ public slots:
     void onTodoParsing(const QString& filename, int lineNo, int ch, const QString& line);
     void onTodoParseFinished();
     void setActiveBreakpoint(QString FileName, int Line, bool setFocus);
+    void updateDPI();
 
 private:
     void prepareProjectForCompile();
diff --git a/RedPandaIDE/utils.cpp b/RedPandaIDE/utils.cpp
index 5648003f..10b14c9e 100644
--- a/RedPandaIDE/utils.cpp
+++ b/RedPandaIDE/utils.cpp
@@ -1001,12 +1001,12 @@ QString localizePath(const QString &path)
 
 float pointToPixel(float point)
 {
-    return point * qApp->desktop()->logicalDpiY() / 72;
+    return point * desktopDpi() / 72;
 }
 
 float pixelToPoint(float pixel)
 {
-    return pixel * 72 / qApp->desktop()->logicalDpiY();
+    return pixel * 72 / desktopDpi();
 }
 
 
@@ -1076,9 +1076,12 @@ QStringList splitProcessCommand(const QString &cmd)
     return result;
 }
 
+static float saved_desktop_dpi = -1;
 float desktopDpi()
 {
-    return qApp->desktop()->logicalDpiY();
+    if (saved_desktop_dpi<1)
+        saved_desktop_dpi = qApp->desktop()->logicalDpiY();
+    return saved_desktop_dpi;
 }
 
 qulonglong stringToHex(const QString &str, qulonglong defaultValue)
@@ -1089,3 +1092,8 @@ qulonglong stringToHex(const QString &str, qulonglong defaultValue)
         return value;
     return defaultValue;
 }
+
+void setDesktopDpi(float dpi)
+{
+    saved_desktop_dpi = dpi;
+}
diff --git a/RedPandaIDE/utils.h b/RedPandaIDE/utils.h
index fee53bab..de920531 100644
--- a/RedPandaIDE/utils.h
+++ b/RedPandaIDE/utils.h
@@ -232,6 +232,8 @@ class CppParser;
 void resetCppParser(std::shared_ptr<CppParser> parser, int compilerSetIndex=-1);
 
 float desktopDpi();
+void setDesktopDpi(float dpi);
+
 float pointToPixel(float point);
 float pixelToPoint(float pixel);