332 lines
9.7 KiB
C++
332 lines
9.7 KiB
C++
/*
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* SPDX-FileCopyrightText: 2014 Hugo Pereira Da Costa <hugo.pereira@free.fr>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "breezeframeshadow.h"
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#include "breezemetrics.h"
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#include <QAbstractScrollArea>
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#include <QApplication>
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#include <QDebug>
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#include <QFrame>
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#include <QMouseEvent>
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#include <QPainter>
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#include <QSplitter>
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#include <KColorUtils>
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namespace Breeze
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{
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//____________________________________________________________________________________
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bool FrameShadowFactory::registerWidget(QWidget *widget, Helper &helper)
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{
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if (!widget) {
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return false;
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}
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if (isRegistered(widget)) {
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return false;
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}
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// check whether widget is a frame, and has the proper shape
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bool accepted = false;
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// cast to frame and check
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QFrame *frame(qobject_cast<QFrame *>(widget));
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if (frame) {
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// also do not install on QSplitter
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/*
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due to Qt, splitters are set with a frame style that matches the condition below,
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though no shadow should be installed, obviously
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*/
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if (qobject_cast<QSplitter *>(widget)) {
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return false;
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}
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// further checks on frame shape, and parent
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if (frame->frameStyle() == (QFrame::StyledPanel | QFrame::Sunken)) {
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accepted = true;
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}
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} else if (widget->inherits("KTextEditor::View")) {
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accepted = true;
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}
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if (!accepted) {
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return false;
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}
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// make sure that the widget is not embedded into a KHTMLView
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QWidget *parent(widget->parentWidget());
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while (parent && !parent->isTopLevel()) {
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if (parent->inherits("KHTMLView")) {
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return false;
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}
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parent = parent->parentWidget();
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}
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// store in set
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_registeredWidgets.insert(widget);
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// catch object destruction
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connect(widget, &QObject::destroyed, this, &FrameShadowFactory::widgetDestroyed);
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// install shadow
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installShadows(widget, helper);
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return true;
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::unregisterWidget(QWidget *widget)
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{
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if (!isRegistered(widget)) {
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return;
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}
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_registeredWidgets.remove(widget);
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removeShadows(widget);
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}
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//____________________________________________________________________________________
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bool FrameShadowFactory::eventFilter(QObject *object, QEvent *event)
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{
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switch (event->type()) {
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// TODO: possibly implement ZOrderChange event, to make sure that
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// the shadow is always painted on top
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case QEvent::ZOrderChange: {
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raiseShadows(object);
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break;
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}
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default:
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break;
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}
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return QObject::eventFilter(object, event);
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::installShadows(QWidget *widget, Helper &helper)
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{
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removeShadows(widget);
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widget->installEventFilter(this);
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widget->installEventFilter(&_addEventFilter);
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installShadow(widget, helper, SideTop);
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installShadow(widget, helper, SideBottom);
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widget->removeEventFilter(&_addEventFilter);
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::removeShadows(QWidget *widget)
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{
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widget->removeEventFilter(this);
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const QList<QObject *> children = widget->children();
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foreach (QObject *child, children) {
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if (FrameShadow *shadow = qobject_cast<FrameShadow *>(child)) {
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shadow->hide();
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shadow->setParent(nullptr);
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shadow->deleteLater();
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}
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}
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::updateShadowsGeometry(const QObject *object, QRect rect) const
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{
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const QList<QObject *> &children = object->children();
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foreach (QObject *child, children) {
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if (FrameShadow *shadow = qobject_cast<FrameShadow *>(child)) {
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shadow->updateGeometry(rect);
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}
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}
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::raiseShadows(QObject *object) const
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{
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const QList<QObject *> &children = object->children();
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foreach (QObject *child, children) {
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if (FrameShadow *shadow = qobject_cast<FrameShadow *>(child)) {
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shadow->raise();
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}
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}
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::update(QObject *object) const
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{
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const QList<QObject *> &children = object->children();
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foreach (QObject *child, children) {
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if (FrameShadow *shadow = qobject_cast<FrameShadow *>(child)) {
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shadow->update();
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}
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}
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::updateState(const QWidget *widget, bool focus, bool hover, qreal opacity, AnimationMode mode) const
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{
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const QList<QObject *> &children = widget->children();
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foreach (QObject *child, children) {
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if (FrameShadow *shadow = qobject_cast<FrameShadow *>(child)) {
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shadow->updateState(focus, hover, opacity, mode);
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}
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}
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::installShadow(QWidget *widget, Helper &helper, Side area) const
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{
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FrameShadow *shadow(nullptr);
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shadow = new FrameShadow(area, helper);
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shadow->setParent(widget);
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shadow->hide();
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}
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//____________________________________________________________________________________
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void FrameShadowFactory::widgetDestroyed(QObject *object)
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{
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_registeredWidgets.remove(object);
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}
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//____________________________________________________________________________________
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FrameShadow::FrameShadow(Side area, Helper &helper)
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: _helper(helper)
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, _area(area)
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{
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setAttribute(Qt::WA_OpaquePaintEvent, false);
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setFocusPolicy(Qt::NoFocus);
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setAttribute(Qt::WA_TransparentForMouseEvents, true);
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setContextMenuPolicy(Qt::NoContextMenu);
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// grab viewport widget
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QWidget *viewport(this->viewport());
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// set cursor from viewport
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if (viewport) {
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setCursor(viewport->cursor());
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}
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}
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//____________________________________________________________________________________
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void FrameShadow::updateGeometry(QRect rect)
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{
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// show on first call
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if (isHidden()) {
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show();
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}
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// store offsets between passed rect and parent widget rect
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QRect parentRect(parentWidget()->contentsRect());
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_margins = QMargins(rect.left() - parentRect.left(), rect.top() - parentRect.top(), rect.right() - parentRect.right(), rect.bottom() - parentRect.bottom());
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// for efficiency, take out the part for which nothing is rendered
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rect.adjust(1, 1, -1, -1);
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// adjust geometry
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const int shadowSize(Metrics::Frame_FrameRadius);
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switch (_area) {
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case SideTop:
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rect.setHeight(shadowSize);
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break;
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case SideBottom:
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rect.setTop(rect.bottom() - shadowSize + 1);
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break;
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case SideLeft:
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rect.setWidth(shadowSize);
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rect.adjust(0, shadowSize, 0, -shadowSize);
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break;
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case SideRight:
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rect.setLeft(rect.right() - shadowSize + 1);
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rect.adjust(0, shadowSize, 0, -shadowSize);
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break;
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default:
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return;
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}
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setGeometry(rect);
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}
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//____________________________________________________________________________________
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void FrameShadow::updateState(bool focus, bool hover, qreal opacity, AnimationMode mode)
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{
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bool changed(false);
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if (_hasFocus != focus) {
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_hasFocus = focus;
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changed |= true;
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}
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if (_mouseOver != hover) {
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_mouseOver = hover;
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changed |= !_hasFocus;
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}
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if (_mode != mode) {
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_mode = mode;
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changed |= (_mode == AnimationNone) || (_mode == AnimationFocus) || (_mode == AnimationHover && !_hasFocus);
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}
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if (_opacity != opacity) {
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_opacity = opacity;
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changed |= (_mode != AnimationNone);
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}
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if (changed) {
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if (QWidget *viewport = this->viewport()) {
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// need to disable viewport updates to avoid some redundant painting
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// besides it fixes one visual glitch (from Qt) in QTableViews
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viewport->setUpdatesEnabled(false);
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update();
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viewport->setUpdatesEnabled(true);
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} else {
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update();
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}
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}
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}
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//____________________________________________________________________________________
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void FrameShadow::paintEvent(QPaintEvent *event)
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{
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// this fixes shadows in frames that change frameStyle() after polish()
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if (QFrame *frame = qobject_cast<QFrame *>(parentWidget())) {
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if (frame->frameStyle() != (QFrame::StyledPanel | QFrame::Sunken)) {
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return;
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}
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}
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const QRect parentRect(parentWidget()->contentsRect().translated(mapFromParent(QPoint(0, 0))));
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const QRect rect(parentRect.adjusted(_margins.left(), _margins.top(), _margins.right(), _margins.bottom()));
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// render
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QPainter painter(this);
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painter.setClipRegion(event->region());
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painter.setRenderHint(QPainter::Antialiasing);
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const QColor outline(_helper.frameOutlineColor(palette(), _mouseOver, _hasFocus, _opacity, _mode));
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painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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_helper.renderFrame(&painter, rect, QColor(), outline);
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}
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//____________________________________________________________________________________
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QWidget *FrameShadow::viewport() const
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{
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if (!parentWidget()) {
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return nullptr;
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} else if (QAbstractScrollArea *widget = qobject_cast<QAbstractScrollArea *>(parentWidget())) {
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return widget->viewport();
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} else {
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return nullptr;
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}
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}
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}
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