1// Copyright (C) 2020 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "qquickstyle.h"
5#include "qquickstyle_p.h"
6#include "qquickstyleplugin_p.h"
7
8#include <QtCore/private/qfileselector_p.h>
9#include <QtCore/qloggingcategory.h>
10#include <QtGui/qstylehints.h>
11#include <QtGui/qguiapplication.h>
12#include <QtQml/qqmlengine.h>
13#include <QtQml/qqmlfile.h>
14#include <QtQml/private/qqmlmetatype_p.h>
15#include <QtQuickTemplates2/private/qquicktheme_p_p.h>
16
17QT_BEGIN_NAMESPACE
18
19Q_LOGGING_CATEGORY(lcStylePlugin, "qt.quick.controls.styleplugin")
20
21QQuickStylePlugin::QQuickStylePlugin(QObject *parent)
22 : QQmlExtensionPlugin(parent)
23{
24}
25
26QQuickStylePlugin::~QQuickStylePlugin()
27{
28}
29
30void QQuickStylePlugin::registerTypes(const char *uri)
31{
32 qCDebug(lcStylePlugin).nospace() << "registerTypes called with uri " << uri << "; plugin name is " << name();
33
34 const QTypeRevision latestControlsRevision = QQmlMetaType::latestModuleVersion(uri: QLatin1String("QtQuick.Controls"));
35 // Use the private function because we don't want to cause resolve() to be called,
36 // as the logic that assigns a default style if one wasn't set would interfere with compile-time style selection.
37 QString styleName = QQuickStylePrivate::style();
38 if (!latestControlsRevision.isValid() && styleName.isEmpty()) {
39 // The user hasn't imported QtQuick.Controls, nor set a style via the runtime methods.
40 qCDebug(lcStylePlugin).nospace() << uri << " imported before QtQuick.Controls; using compile-time style selection";
41 QQuickStyle::setStyle(name());
42 styleName = name();
43 }
44
45 // Even if this style plugin isn't for the style set by the user,
46 // we still want to create the theme object, because that function
47 // is also responsible for reading values from qtquickcontrols2.conf.
48 // So, even if a style doesn't have a QQuickTheme, it can still have
49 // values set for (e.g. fonts and palettes) in qtquickcontrols2.conf.
50 const QString effectiveCurrentStyleName = QQuickStylePrivate::effectiveStyleName(styleName);
51 auto theme = QQuickTheme::instance();
52 if (!theme) {
53 qCDebug(lcStylePlugin) << "creating theme";
54 theme = createTheme(name: effectiveCurrentStyleName);
55 }
56
57 // The primary fallback is the style set by the user. We need to check for that here
58 // so that we can ensure that fallback styles' themes are initialized (QTBUG-117403)
59 // without also allowing the Basic style to be initialized, as it is a secondary fallback
60 // for every built-in style (and only built-in styles can be fallbacks).
61 const bool thisPluginBelongsToCurrentStyle = name() == effectiveCurrentStyleName;
62 const bool isPrimaryFallback = name() == QQuickStylePrivate::fallbackStyle();
63 if (!thisPluginBelongsToCurrentStyle && !isPrimaryFallback) {
64 qCDebug(lcStylePlugin).nospace() << "this style plugin does not belong to the current ("
65 << effectiveCurrentStyleName << ") or fallback (" << QQuickStylePrivate::fallbackStyle()
66 << ") style; not calling initializeTheme()";
67 return;
68 }
69
70 if (thisPluginBelongsToCurrentStyle) {
71 qCDebug(lcStylePlugin).nospace() << "this style plugin belongs to the current style "
72 << effectiveCurrentStyleName << "; calling initializeTheme()";
73 } else {
74 qCDebug(lcStylePlugin).nospace() << "this style plugin belongs to the fallback style "
75 << QQuickStylePrivate::fallbackStyle() << "; calling initializeTheme()";
76 }
77 initializeTheme(theme);
78 connect(sender: QGuiApplication::styleHints(), signal: &QStyleHints::colorSchemeChanged,
79 context: this, slot: &QQuickStylePlugin::updateTheme);
80
81 if (!isPrimaryFallback && !styleName.isEmpty())
82 QFileSelectorPrivate::addStatics(QStringList() << styleName);
83}
84
85void QQuickStylePlugin::unregisterTypes()
86{
87 qCDebug(lcStylePlugin) << "unregisterTypes called; plugin name is" << name();
88 if (!QQuickThemePrivate::instance)
89 return;
90
91 disconnect(sender: QGuiApplication::styleHints(), signal: &QStyleHints::colorSchemeChanged,
92 receiver: this, slot: &QQuickStylePlugin::updateTheme);
93
94 // Not every style has a plugin - some styles are QML-only. So, we clean this
95 // stuff up when the first style plugin is unregistered rather than when the
96 // plugin for the current style is unregistered.
97 QQuickThemePrivate::instance.reset();
98 QQuickStylePrivate::reset();
99}
100
101/*!
102 \internal
103
104 Responsible for setting the font and palette settings that were specified in the
105 qtquickcontrols2.conf file.
106
107 Style-specific settings (e.g. Variant=Dense) are read in the constructor of the
108 appropriate style plugin (e.g. QtQuickControls2MaterialStylePlugin).
109
110 Implicit style-specific font and palette values are assigned in the relevant theme
111 (e.g. QQuickMaterialTheme).
112*/
113QQuickTheme *QQuickStylePlugin::createTheme(const QString &name)
114{
115 qCDebug(lcStylePlugin) << "creating QQuickTheme instance to be initialized by style-specific theme of" << name;
116
117 QQuickTheme *theme = new QQuickTheme;
118#if QT_CONFIG(settings)
119 QQuickThemePrivate *p = QQuickThemePrivate::get(theme);
120 QSharedPointer<QSettings> settings = QQuickStylePrivate::settings(name);
121 if (settings) {
122 p->defaultFont.reset(other: QQuickStylePrivate::readFont(settings));
123 // Set the default font as the System scope, because that's what
124 // QQuickControlPrivate::parentFont() uses as its fallback if no
125 // parent item has a font explicitly set. QQuickControlPrivate::parentFont()
126 // is used as the starting point for font inheritance/resolution.
127 // The same goes for palettes below.
128 theme->setFont(scope: QQuickTheme::System, font: *p->defaultFont);
129
130 p->defaultPalette.reset(other: QQuickStylePrivate::readPalette(settings));
131 theme->setPalette(scope: QQuickTheme::System, palette: *p->defaultPalette);
132 }
133#endif
134 QQuickThemePrivate::instance.reset(p: theme);
135 return theme;
136}
137
138QT_END_NAMESPACE
139
140#include "moc_qquickstyleplugin_p.cpp"
141

source code of qtdeclarative/src/quickcontrols/qquickstyleplugin.cpp