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From f8f6b9d084decbad8ee90880493c413ac90c2911 Mon Sep 17 00:00:00 2001
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From: Andreas Hartmetz <andreas@ixgreen.de>
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Date: Fri, 5 Mar 2021 12:41:06 +0100
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Subject: [PATCH 14/20] QQuickWindow: don't leak old screenChanged connections
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Connections could accumulate. Because the newest one was invoked
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last due to how signal-slot invocations are ordered, rendering
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was correct, but the stale connections caused unnecessary updates
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(and wasted a small amount of memory).
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This comes from a misunderstanding I had at the time about how
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QMetaObject::Connection works. Destroying or overwriting one does
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not affect the actual connection.
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While at it, also modernize the connect().
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Pick-to: 5.15 6.0 6.1
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Change-Id: Idde81bdbff8947ed517bf2740d623a395c0acb74
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Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
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(cherry picked from commit 9f8292d48913c5bc50377749c2b3e030cf16d703)
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---
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src/quick/items/qquickwindow.cpp | 7 +++----
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1 file changed, 3 insertions(+), 4 deletions(-)
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diff --git a/src/quick/items/qquickwindow.cpp b/src/quick/items/qquickwindow.cpp
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index eea1e93f32..c956c85091 100644
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--- a/src/quick/items/qquickwindow.cpp
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+++ b/src/quick/items/qquickwindow.cpp
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@@ -450,15 +450,14 @@ void QQuickWindow::physicalDpiChanged()
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void QQuickWindow::handleScreenChanged(QScreen *screen)
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{
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Q_D(QQuickWindow);
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+ disconnect(d->physicalDpiChangedConnection);
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if (screen) {
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physicalDpiChanged();
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// When physical DPI changes on the same screen, either the resolution or the device pixel
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// ratio changed. We must check what it is. Device pixel ratio does not have its own
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// ...Changed() signal.
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- d->physicalDpiChangedConnection = connect(screen, SIGNAL(physicalDotsPerInchChanged(qreal)),
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- this, SLOT(physicalDpiChanged()));
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- } else {
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- disconnect(d->physicalDpiChangedConnection);
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+ d->physicalDpiChangedConnection = connect(screen, &QScreen::physicalDotsPerInchChanged,
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+ this, &QQuickWindow::physicalDpiChanged);
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}
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d->forcePolish();
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--
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2.35.1
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