Chris@668: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@668: 
Chris@668: /*
Chris@668:     Vect
Chris@668:     An experimental audio player for plural recordings of a work
Chris@668:     Centre for Digital Music, Queen Mary, University of London.
Chris@668: 
Chris@668:     This file is taken from Rosegarden, a MIDI and audio sequencer and
Chris@668:     musical notation editor. Copyright 2000-2018 the Rosegarden
Chris@668:     development team. Thorn style developed in stylesheet form by
Chris@668:     D. Michael McIntyre and reimplemented as a class by David Faure.
Chris@668: 
Chris@668:     This program is free software; you can redistribute it and/or
Chris@668:     modify it under the terms of the GNU General Public License as
Chris@668:     published by the Free Software Foundation; either version 2 of the
Chris@668:     License, or (at your option) any later version.  See the file
Chris@668:     COPYING included with this distribution for more information.
Chris@668: */
Chris@668: 
Chris@668: #include "ThornStyle.h"
Chris@668: #include "AppEventFilter.h"
Chris@668: 
Chris@668: #include <QApplication>
Chris@668: #include <QFileDialog>
Chris@668: #include <QAbstractItemView>
Chris@668: #include <QCheckBox>
Chris@668: #include <QLabel>
Chris@668: #include <QRadioButton>
Chris@668: #include <QToolBar>
Chris@668: #include <QWidget>
Chris@668: #include <QDialogButtonBox>
Chris@668: #include <QPushButton>
Chris@668: #include <QComboBox>
Chris@668: #include <QSpinBox>
Chris@668: 
Chris@668: // Apply the style to widget and its children, recursively
Chris@668: // Even though every widget goes through the event filter, this is needed
Chris@668: // for the case where a whole widget hierarchy is suddenly reparented into the file dialog.
Chris@668: // Then we need to apply the app style again. Testcase: scrollbars in file dialog.
Chris@668: static void applyStyleRecursive(QWidget* widget, QStyle *style)
Chris@668: {
Chris@668:     if (widget->style() != style) {
Chris@668:         widget->setStyle(style);
Chris@668:     }
Chris@668:     foreach (QObject* obj, widget->children()) {
Chris@668:         if (obj->isWidgetType()) {
Chris@668:             QWidget *w = static_cast<QWidget *>(obj);
Chris@668:             applyStyleRecursive(w, style);
Chris@668:         }
Chris@668:     }
Chris@668: }
Chris@668: 
Chris@668: AppEventFilter::AppEventFilter() :
Chris@668:     m_systemPalette(qApp->palette()),
Chris@668:     m_systemStyle(qApp->style()) {
Chris@668: }
Chris@668: 
Chris@668: bool
Chris@668: AppEventFilter::shouldIgnoreThornStyle(QWidget *widget) const {
Chris@668:     return qobject_cast<QFileDialog *>(widget)
Chris@668:         || widget->inherits("KDEPlatformFileDialog")
Chris@668:         || widget->inherits("KDirSelectDialog");
Chris@668: }
Chris@668: 
Chris@668: // when we ditch Qt4, we can switch to qCDebug...
Chris@668: //#define DEBUG_EVENTFILTER
Chris@668: 
Chris@668: bool AppEventFilter::eventFilter(QObject *watched, QEvent *event)
Chris@668: {
Chris@668:     static bool s_insidePolish = false; // setStyle calls polish again, so skip doing the work twice
Chris@668:     if (!s_insidePolish && watched->isWidgetType() && event->type() == QEvent::Polish) {
Chris@668:         s_insidePolish = true;
Chris@668:         // This is called after every widget is created and just before being shown
Chris@668:         // (we use this so that it has a proper parent widget already)
Chris@668:         QWidget *widget = static_cast<QWidget *>(watched);
Chris@668:         if (shouldIgnoreThornStyle(widget)) {
Chris@668:             // The palette from the mainwindow propagated to the dialog, restore it.
Chris@668:             widget->setPalette(m_systemPalette);
Chris@668: #ifdef DEBUG_EVENTFILTER
Chris@668:             qDebug() << widget << "now using app style (recursive)";
Chris@668: #endif
Chris@668:             applyStyleRecursive(widget, qApp->style());
Chris@668:             s_insidePolish = false;
Chris@668:             return false;
Chris@668:         }
Chris@668:         QWidget *toplevel = widget->window();
Chris@668: #ifdef DEBUG_EVENTFILTER
Chris@668:         qDebug() << widget << "current widget style=" << widget->style() << "shouldignore=" << shouldIgnoreThornStyle(toplevel);
Chris@668: #endif
Chris@668:         if (shouldIgnoreThornStyle(toplevel)) {
Chris@668:             // Here we should apply qApp->style() recursively on widget and its children, in case one was reparented
Chris@668: #ifdef DEBUG_EVENTFILTER
Chris@668:             qDebug() << widget << widget->objectName() << "in" << toplevel << "now using app style (recursive)";
Chris@668: #endif
Chris@668:             applyStyleRecursive(widget, qApp->style());
Chris@668:         } else if (widget->style() != &m_style) {
Chris@668: #ifdef DEBUG_EVENTFILTER
Chris@668:             //qDebug() << "    ToolTipBase=" << widget->palette().color(QPalette::ToolTipBase).name();
Chris@668: #endif
Chris@668:             // Apply style recursively because some child widgets (e.g. QHeaderView in QTreeWidget, in DeviceManagerDialog) don't seem to get here.
Chris@668:             if (qobject_cast<QAbstractItemView *>(widget)) {
Chris@668:                 applyStyleRecursive(widget, &m_style);
Chris@668:             } else {
Chris@668:                 widget->setStyle(&m_style);
Chris@668:             }
Chris@668: #ifdef DEBUG_EVENTFILTER
Chris@668:             qDebug() << "    now using style" << widget->style();
Chris@668: #endif
Chris@668:             if (widget->windowType() != Qt::Widget) { // window, tooltip, ...
Chris@668:                 widget->setPalette(m_style.standardPalette());
Chris@668: #ifdef DEBUG_EVENTFILTER
Chris@668:                 qDebug() << "    after setPalette:     ToolTipBase=" << widget->palette().color(QPalette::ToolTipBase).name();
Chris@668: #endif
Chris@668:             } else {
Chris@668: #ifdef DEBUG_EVENTFILTER
Chris@668:                 //qDebug() << "    not a toplevel. ToolTipBase=" << widget->palette().color(QPalette::ToolTipBase).name();
Chris@668: #endif
Chris@668:             }
Chris@668:             polishWidget(widget);
Chris@668:         }
Chris@668:         s_insidePolish = false;
Chris@668:     }
Chris@668:     return false; // don't eat the event
Chris@668: }
Chris@668: 
Chris@668: void AppEventFilter::polishWidget(QWidget *widget)
Chris@668: {
Chris@668:     if (QLabel *label = qobject_cast<QLabel *>(widget)) {
Chris@668:         if (qobject_cast<QToolBar *>(widget->parentWidget())) {
Chris@668:             /* Toolbars must be light enough for black icons, therefore black text on their
Chris@668:                QLabels, rather than white, is more appropriate.
Chris@668:                QToolBar QLabel { color: #000000; } */
Chris@668:             QPalette pal = label->palette();
Chris@668:             pal.setColor(label->foregroundRole(), Qt::black);
Chris@668:             label->setPalette(pal);
Chris@668:             //qDebug() << "made label black:" << label << label->text();
Chris@668:         }
Chris@668:         if (widget->objectName() == "SPECIAL_LABEL") {
Chris@668:             widget->setAutoFillBackground(true);
Chris@668:             // QWidget#SPECIAL_LABEL { color: #000000; background-color: #999999; }
Chris@668:             QPalette palette = widget->palette();
Chris@668:             palette.setColor(QPalette::WindowText, Qt::black);
Chris@668:             palette.setColor(QPalette::Window, QColor(0x99, 0x99, 0x99));
Chris@668:             widget->setPalette(palette);
Chris@668:         }
Chris@668:     } else if (widget->objectName() == "Rosegarden Transport") {
Chris@668:         // Give the non-LED parts of the dialog the groupbox "lighter black"
Chris@668:         // background for improved contrast.
Chris@668:         QPalette transportPalette = widget->palette();
Chris@668:         transportPalette.setColor(widget->backgroundRole(), QColor(0x40, 0x40, 0x40));
Chris@668:         widget->setPalette(transportPalette);
Chris@668:         widget->setAutoFillBackground(true);
Chris@668:     } else if (QCheckBox *cb = qobject_cast<QCheckBox *>(widget)) {
Chris@668:         cb->setAttribute(Qt::WA_Hover);
Chris@668:     } else if (QRadioButton *rb = qobject_cast<QRadioButton *>(widget)) {
Chris@668:         rb->setAttribute(Qt::WA_Hover);
Chris@668:     } else if (QPushButton *pb = qobject_cast<QPushButton *>(widget)) {
Chris@668:         pb->setAttribute(Qt::WA_Hover);
Chris@668:         if (qobject_cast<QDialogButtonBox *>(widget->parentWidget())) {
Chris@668:             // Bug in QDialogButtonBox: if the app style sets QStyle::SH_DialogButtonBox_ButtonsHaveIcons
Chris@668:             // a later call to setStyle() doesn't remove the button icon again.
Chris@668:             // Fix submitted at https://codereview.qt-project.org/183788
Chris@668:             pb->setIcon(QIcon());
Chris@668:         }
Chris@668:     } else if (QComboBox *cb = qobject_cast<QComboBox *>(widget)) {
Chris@668:         cb->setAttribute(Qt::WA_Hover);
Chris@668:     } else if (QAbstractSpinBox *sb = qobject_cast<QAbstractSpinBox *>(widget)) {
Chris@668:         sb->setAttribute(Qt::WA_Hover);
Chris@668:     }
Chris@668: }