Add a small 1/5 second delay between the zoom slider changing and the actual update of the zoom level (prevent flickering and seizures from rapidly changing the slider).

2 files changed, 12 insertions, 1 deletions

diff --git a/src-qt5/desktop-utils/lumina-screenshot/MainUI.cpp b/src-qt5/desktop-utils/lumina-screenshot/MainUI.cpp
index 9dd6c9d3..ac17ee3e 100644
--- a/src-qt5/desktop-utils/lumina-screenshot/MainUI.cpp
+++ b/src-qt5/desktop-utils/lumina-screenshot/MainUI.cpp
@@ -26,6 +26,9 @@ MainUI::MainUI() : QMainWindow(), ui(new Ui::MainUI){
     ui->spin_monitor->setEnabled(false);
     ui->radio_monitor->setEnabled(false);
   }	  
+  scaleTimer = new QTimer(this);
+    scaleTimer->setSingleShot(true);
+    scaleTimer->setInterval(200); //~1/5 second
 
   //Setup the connections
   connect(ui->tool_save, SIGNAL(clicked()), this, SLOT(saveScreenshot()) );
@@ -38,7 +41,8 @@ MainUI::MainUI() : QMainWindow(), ui(new Ui::MainUI){
   connect(ui->tool_crop, SIGNAL(clicked()), IMG, SLOT(cropImage()) );
   connect(IMG, SIGNAL(selectionChanged(bool)), this, SLOT(imgselchanged(bool)) );
   connect(IMG, SIGNAL(scaleFactorChanged(int)), this, SLOT(imgScalingChanged(int)) );
-  connect(ui->slider_zoom, SIGNAL(valueChanged(int)), this, SLOT(imgScalingChanged()) );
+  connect(ui->slider_zoom, SIGNAL(valueChanged(int)),  this, SLOT(sliderChanged()) );
+  connect(scaleTimer, SIGNAL(timeout()), this, SLOT(imgScalingChanged()) );
 
   settings = new QSettings("lumina-desktop", "lumina-screenshot",this);
   if(settings->value("screenshot-target", "window").toString() == "window") {
@@ -130,6 +134,11 @@ void MainUI::imgScalingChanged(int percent){
   ui->label_zoom_percent->setText( QString::number(ui->slider_zoom->value())+"%");
 }
 
+void MainUI::sliderChanged(){
+  ui->label_zoom_percent->setText( QString::number(ui->slider_zoom->value())+"%");
+  scaleTimer->start();
+}
+
 bool MainUI::getWindow(){
   //Use this function to set cwin
   cwin = 0;
diff --git a/src-qt5/desktop-utils/lumina-screenshot/MainUI.h b/src-qt5/desktop-utils/lumina-screenshot/MainUI.h
index f7319541..bb1b61df 100644
--- a/src-qt5/desktop-utils/lumina-screenshot/MainUI.h
+++ b/src-qt5/desktop-utils/lumina-screenshot/MainUI.h
@@ -46,6 +46,7 @@ private:
 	WId cwin; //current window to screenshot
 	QSettings *settings;
 	LXCB *XCB; //Library access to window subsystems
+	QTimer *scaleTimer;
 
 	//Image Editor widget
 	ImageEditor *IMG;
@@ -65,6 +66,7 @@ private slots:
 
 	void imgselchanged(bool hassel);
 	void imgScalingChanged(int percent = -1);
+	void sliderChanged();
 
 	//Utility functions to perform a screenshot
 	bool getWindow(); //set the "cwin" variable as appropriate