/*
Copyright (C) 2012, University of Cambridge, Department of Psychiatry.
Created by Rudolf Cardinal (rnc1001@cam.ac.uk).
This file is part of CamCOPS.
CamCOPS is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
CamCOPS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with CamCOPS. If not, see <https://www.gnu.org/licenses/>.
*/
// ============================================================================
// Widget manipulations
// ============================================================================
#include "widgetfunc.h"
#include "common/cssconst.h"
#include "lib/css.h"
#include <QByteArray>
#include <QColor>
#include <QDebug>
#include <QLayout>
#include <QLayoutItem>
#include <QPlainTextEdit>
#include <QScrollBar>
#include <QString>
#include <QStyle>
#include <QVariant>
#include <QWidget>
namespace widgetfunc {
void setBackgroundColour(QWidget* widget, const QColor& colour)
{
// https://wiki.qt.io/How_to_Change_the_Background_Color_of_QWidget
// Palette method not working. (Conflict with stylesheet?)
// https://doc.qt.io/qt-6.5/qwidget.html#autoFillBackground-prop
//
// QPalette palette(widget->palette());
// palette.setColor(QPalette::Background, Qt::red);
// widget->setPalette(palette);
// widget->setAutoFillBackground(true);
// Stylesheet method working.
widget->setStyleSheet("background-color:" + css::colourCss(colour) + ";");
// See also:
// https://stackoverflow.com/questions/25466030/make-qwidget-transparent
// https://doc.qt.io/qt-6.5/qwidget.html#transparency-and-double-buffering
}
void setBackgroundAndPressedColour(QWidget* widget,
const QColor& background,
const QColor& pressed)
{
// untested
widget->setStyleSheet(QString(
"QWidget {"
" background-color: %1;"
"}"
"QWidget:pressed {"
" background-color: %1;"
"}").arg(css::colourCss(background), css::colourCss(pressed)));
}
void removeAllChildWidgets(QObject* object)
{
// http://stackoverflow.com/questions/22643853/qt-clear-all-widgets-from-inside-a-qwidgets-layout
// ... modified a little
qDebug() << "removeAllChildWidgets";
for (QWidget* w : object->findChildren<QWidget*>()) {
// qDebug() << "1";
if (!(w->windowFlags() & Qt::Window)) {
// qDebug() << "2";
delete w;
}
}
// BUT layouts do not become parents of their widgets:
// http://stackoverflow.com/questions/4065378/qt-get-children-from-layout
}
const Qt::Alignment HALIGN_MASK = (Qt::AlignLeft | Qt::AlignRight |
Qt::AlignHCenter | Qt::AlignJustify);
const Qt::Alignment VALIGN_MASK = (Qt::AlignTop | Qt::AlignBottom |
Qt::AlignVCenter | Qt::AlignBaseline);
Qt::Alignment combineAlignment(const Qt::Alignment halign,
const Qt::Alignment valign)
{
return (halign & HALIGN_MASK) | (valign & VALIGN_MASK);
}
void repolish(QWidget* widget)
{
// http://wiki.qt.io/DynamicPropertiesAndStylesheets
// http://stackoverflow.com/questions/18187376/stylesheet-performance-hits-with-qt
widget->style()->unpolish(widget);
widget->style()->polish(widget);
widget->update();
}
void setProperty(QWidget* widget, const QString& property,
const QVariant& value, const bool repolish_afterwards)
{
if (!widget) {
qWarning() << Q_FUNC_INFO << "- ignored for null widget";
return;
}
const QByteArray propdata = property.toLatin1();
const char* propname = propdata.constData();
widget->setProperty(propname, value);
if (repolish_afterwards) {
repolish(widget);
}
}
QString cssBoolean(const bool value)
{
return value ? cssconst::VALUE_TRUE : cssconst::VALUE_FALSE;
}
void setPropertyItalic(QWidget* widget, const bool italic, const bool repolish)
{
setProperty(widget, cssconst::PROPERTY_ITALIC, cssBoolean(italic),
repolish);
}
void setPropertyMissing(QWidget* widget,
const bool missing, const bool repolish)
{
setProperty(widget, cssconst::PROPERTY_MISSING, cssBoolean(missing),
repolish);
}
void clearLayout(QLayout* layout, bool delete_widgets)
{
// DANGER: do not use "delete"; use "deleteLater()".
// If you use delete, if this is used from signals from within this layout;
// you can get a segfault from e.g. QAbstractItemView::mouseReleaseEvent.
if (!layout) {
qWarning() << "Null pointer passed to clearLayout";
return;
}
// http://stackoverflow.com/questions/4857188/clearing-a-layout-in-qt
// https://stackoverflow.com/questions/4272196/qt-remove-all-widgets-from-layout
// For all the layout items in our layout...
while (QLayoutItem* item = layout->takeAt(0)) {
// We now own "item", so may (and will) delete it.
// If the layout item has a layout, clear it out
if (QLayout* child_layout = item->layout()) {
clearLayout(child_layout, delete_widgets);
child_layout->deleteLater();
}
// If the layout item has a widget, and we're deleting widgets, delete
// this widget
if (delete_widgets) {
if (QWidget* child_widget = item->widget()) {
child_widget->deleteLater();
}
}
// Delete the layout item (which we own).
delete item;
}
layout->invalidate();
}
void scrollToEnd(QPlainTextEdit* editor)
{
QScrollBar* vsb = editor->verticalScrollBar();
if (vsb) {
vsb->setValue(vsb->maximum());
}
QScrollBar* hsb = editor->horizontalScrollBar();
if (hsb) {
hsb->setValue(0);
}
}
void scrollToStart(QPlainTextEdit* editor)
{
QScrollBar* vsb = editor->verticalScrollBar();
if (vsb) {
vsb->setValue(0);
}
QScrollBar* hsb = editor->horizontalScrollBar();
if (hsb) {
hsb->setValue(0);
}
}
/*
bool isScrollAtEnd(QPlainTextEdit* editor)
{
QScrollBar* vsb = editor->verticalScrollBar();
return vsb && vsb->value() == vsb->maximum();
}
*/
} // namespace widgetfunc