diff options
author | J-P Nurmi <jpnurmi@qt.io> | 2017-09-06 12:48:55 +0200 |
---|---|---|
committer | J-P Nurmi <jpnurmi@qt.io> | 2017-12-11 12:09:57 +0000 |
commit | 458eb65f730178bc93ba7b18f0e4dd2a13efad2e (patch) | |
tree | 3f61c4a1f28383365144d401b48f9fc4527bb311 /tests/auto/customization/data/styles/incomplete/RadioButton.qml | |
parent | bd617ed62ba35ee11da75b7e92db3fd190751b0f (diff) |
Buttons: defer the execution of the delegates
In practice, deferring the execution of the delegates (until
accessed) means that the default delegate item does not get created
at all, when a custom control replaces it at construction time.
Button {
background: Rectangle { ... }
}
Before, such custom Button would never be faster than the original
one, because the default delegate was first created and then thrown
away at construction time. Originally, this was not considered a huge
problem, because the plan was to keep the default delegates so light-
weight that it wouldn't matter. However, then came the fancy styles
with shadows and effects and thus, heavier default delegates. There's
also a growing demand for more features, and the default delegates
are slowly getting heavier...
Now, after this patch, if you replace a heavy default delegate with
a light and simple custom delegate, the result is a much faster
control. For example, replacing Material style Button's background,
which has a shadow effect, with a plain Rectangle gives a ~10x boost,
because the default background with its heavy shadow effect is not
executed at all.
At the same time, deferring the execution of the default delegates
avoids troubles with asynchronous incubation, because we don't need
to destroy an object in the middle of the incubation process.
Task-number: QTBUG-50992
Change-Id: I2274bff99b9ff126d3748278d58d859222910c98
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Diffstat (limited to 'tests/auto/customization/data/styles/incomplete/RadioButton.qml')
-rw-r--r-- | tests/auto/customization/data/styles/incomplete/RadioButton.qml | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/tests/auto/customization/data/styles/incomplete/RadioButton.qml b/tests/auto/customization/data/styles/incomplete/RadioButton.qml new file mode 100644 index 00000000..933f3f0e --- /dev/null +++ b/tests/auto/customization/data/styles/incomplete/RadioButton.qml @@ -0,0 +1,61 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the test suite of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +import QtQuick 2.9 +import QtQuick.Templates 2.2 as T + +T.CheckBox { + id: control + objectName: "radiobutton-incomplete" + + indicator: Item { + objectName: "radiobutton-indicator-incomplete" + } +} |