From e31f0e1f42b11eabfd02d5d5759aeef0c0ef72b6 Mon Sep 17 00:00:00 2001
From: Tobias Markmann <tm@ayena.de>
Date: Thu, 28 Apr 2011 19:59:26 +0200
Subject: Hiding widgets which aren't visible anyway to prevent them from
 redrawing.

License: This patch is BSD-licensed, see http://www.opensource.org/licenses/bsd-license.php

diff --git a/Swift/QtUI/QtChatTabs.cpp b/Swift/QtUI/QtChatTabs.cpp
index 249080b..9063001 100644
--- a/Swift/QtUI/QtChatTabs.cpp
+++ b/Swift/QtUI/QtChatTabs.cpp
@@ -39,6 +39,8 @@ QtChatTabs::QtChatTabs() : QWidget() {
 #else
 #warning Qt 4.5 or later is needed. Trying anyway, some things will be disabled.
 #endif
+	connect(tabs_, SIGNAL(currentChanged(int)), this, SLOT(handleTabChange(int)), Qt::UniqueConnection);
+
 	QVBoxLayout *layout = new QVBoxLayout;
 	layout->setSpacing(0);
 	layout->setContentsMargins(0, 3, 0, 0);
@@ -64,6 +66,13 @@ void QtChatTabs::addTab(QtTabbable* tab) {
 	QSizePolicy policy = sizePolicy();
 	/* Chat windows like to grow - don't let them */
 	setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+
+	/* Hide previous opened QtChatWindow, so it doesn't receive further QPaint events. */
+	QWidget* old = tabs_->currentWidget();
+	if (old) {
+		old->hide();
+	}
+
 	tabs_->addTab(tab, tab->windowTitle());
 	connect(tab, SIGNAL(titleUpdated()), this, SLOT(handleTabTitleUpdated()), Qt::UniqueConnection);
 	connect(tab, SIGNAL(countUpdated()), this, SLOT(handleTabTitleUpdated()), Qt::UniqueConnection);
@@ -252,6 +261,11 @@ void QtChatTabs::handleTabTitleUpdated(QWidget* widget) {
 	std::string current(Q2PSTRING(qobject_cast<QtTabbable*>(tabs_->currentWidget())->windowTitle()));
 	ChatMessageSummarizer summary;
 	setWindowTitle(summary.getSummary(current, unreads).c_str());
+
+	/* hide() QtChatWindow again, so it won't receive Paint events. */
+	if (widget != tabs_->currentWidget()) {
+		widget->hide();
+	}
 }
 
 void QtChatTabs::flash() {
@@ -260,6 +274,18 @@ void QtChatTabs::flash() {
 #endif
 }
 
+void QtChatTabs::handleTabChange(int index) {
+	if (index == -1) {
+		return;
+	}
+	/* hide() old tab, show() new tab */
+	QWidget* old_tab = tabs_->currentWidget();
+	old_tab->hide();
+	
+	QWidget* new_tab = tabs_->widget(index);
+	new_tab->show();
+}
+
 void QtChatTabs::resizeEvent(QResizeEvent*) {
 	emit geometryChanged();
 }
diff --git a/Swift/QtUI/QtChatTabs.h b/Swift/QtUI/QtChatTabs.h
index 233c574..19a486c 100644
--- a/Swift/QtUI/QtChatTabs.h
+++ b/Swift/QtUI/QtChatTabs.h
@@ -39,6 +39,7 @@ namespace Swift {
 			void handleRequestedPreviousTab();
 			void handleRequestedNextTab();
 			void handleRequestedActiveTab();
+			void handleTabChange(int index);
 			void flash();
 
 		private:
-- 
cgit v0.10.2-6-g49f6