src/selectionmode/selectionmodetopbar.cpp

   1 /*
   2     This file is part of the KDE project
   3     SPDX-FileCopyrightText: 2022 Felix Ernst <fe.a.ernst@gmail.com>
   4
   5     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
   6 */
   7
   8 #include "selectionmodetopbar.h"
   9
  10 #include "backgroundcolorhelper.h"
  11
  12 #include <KColorScheme>
  13 #include <KLocalizedString>
  14 #include <KToolTipHelper>
  15
  16 #include <QHBoxLayout>
  17 #include <QLabel>
  18 #include <QPalette>
  19 #include <QPropertyAnimation>
  20 #include <QPushButton>
  21 #include <QScrollArea>
  22 #include <QStyle>
  23 #include <QtGlobal>
  24
  25 #include <type_traits>
  26 #include <iostream>
  27
  28 SelectionModeTopBar::SelectionModeTopBar(QWidget *parent) :
  29     QWidget{parent}
  30 {
  31     // Showing of this widget is normally animated. We hide it for now and make it small.
  32     hide();
  33     setMaximumHeight(0);
  34
  35     setToolTip(KToolTipHelper::whatsThisHintOnly());
  36     setWhatsThis(xi18nc("@info:whatsthis", "<title>Selection Mode</title><para>Select files or folders to manage or manipulate them."
  37         "<list><item>Press on a file or folder to select it.</item><item>Press on an already selected file or folder to deselect it.</item>"
  38         "<item>Pressing an empty area does <emphasis>not</emphasis> clear the selection.</item>"
  39         "<item>Selection rectangles (created by dragging from an empty area) invert the selection status of items within.</item></list></para>"
  40         "<para>The available action buttons at the bottom change depending on the current selection.</para>"));
  41
  42     auto fillParentLayout = new QGridLayout(this);
  43     fillParentLayout->setContentsMargins(0, 0, 0, 0);
  44
  45     // Put the contents into a QScrollArea. This prevents increasing the view width
  46     // in case that not enough width for the contents is available. (this trick is also used in selectionmodebottombar.cpp.)
  47     auto scrollArea = new QScrollArea(this);
  48     fillParentLayout->addWidget(scrollArea);
  49     scrollArea->setFrameShape(QFrame::NoFrame);
  50     scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  51     scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  52     scrollArea->setWidgetResizable(true);
  53
  54     auto contentsContainer = new QWidget(scrollArea);
  55     scrollArea->setWidget(contentsContainer);
  56
  57     BackgroundColorHelper::instance()->controlBackgroundColor(this);
  58
  59     setMinimumWidth(0);
  60
  61     m_fullLabelString = i18nc("@info label above the view explaining the state",
  62                                      "Selection Mode: Click on files or folders to select or deselect them.");
  63     m_shortLabelString = i18nc("@info label above the view explaining the state",
  64                                      "Selection Mode");
  65     m_label = new QLabel(contentsContainer);
  66     m_label->setMinimumWidth(0);
  67     BackgroundColorHelper::instance()->controlBackgroundColor(m_label);
  68
  69     m_closeButton = new QPushButton(QIcon::fromTheme(QStringLiteral("window-close-symbolic")), "", contentsContainer);
  70     m_closeButton->setToolTip(i18nc("@action:button", "Exit Selection Mode"));
  71     m_closeButton->setAccessibleName(m_closeButton->toolTip());
  72     m_closeButton->setFlat(true);
  73     connect(m_closeButton, &QAbstractButton::pressed,
  74             this, &SelectionModeTopBar::leaveSelectionModeRequested);
  75
  76     QHBoxLayout *layout = new QHBoxLayout(contentsContainer);
  77     auto contentsMargins = layout->contentsMargins();
  78     m_preferredHeight = contentsMargins.top() + m_label->sizeHint().height() + contentsMargins.bottom();
  79     scrollArea->setMaximumHeight(m_preferredHeight);
  80     m_closeButton->setFixedHeight(m_preferredHeight);
  81     layout->setContentsMargins(0, 0, 0, 0);
  82
  83     layout->addStretch();
  84     layout->addWidget(m_label);
  85     layout->addStretch();
  86     layout->addWidget(m_closeButton);
  87 }
  88
  89 void SelectionModeTopBar::setVisible(bool visible, Animated animated)
  90 {
  91     Q_ASSERT_X(animated == WithAnimation, "SelectionModeTopBar::setVisible", "This wasn't implemented.");
  92
  93     if (!m_heightAnimation) {
  94         m_heightAnimation = new QPropertyAnimation(this, "maximumHeight");
  95     }
  96     disconnect(m_heightAnimation, &QAbstractAnimation::finished,
  97                this, &QWidget::hide);
  98     m_heightAnimation->setDuration(2 *
  99             style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, this) *
 100             GlobalConfig::animationDurationFactor());
 101
 102     if (visible) {
 103         show();
 104         m_heightAnimation->setStartValue(0);
 105         m_heightAnimation->setEndValue(m_preferredHeight);
 106         m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
 107     } else {
 108         m_heightAnimation->setStartValue(height());
 109         m_heightAnimation->setEndValue(0);
 110         m_heightAnimation->setEasingCurve(QEasingCurve::OutCubic);
 111         connect(m_heightAnimation, &QAbstractAnimation::finished,
 112                 this, &QWidget::hide);
 113     }
 114
 115     m_heightAnimation->start();
 116 }
 117
 118 void SelectionModeTopBar::resizeEvent(QResizeEvent */* resizeEvent */)
 119 {
 120     updateLabelString();
 121 }
 122
 123 void SelectionModeTopBar::updateLabelString()
 124 {
 125     QFontMetrics fontMetrics = m_label->fontMetrics();
 126     if (fontMetrics.horizontalAdvance(m_fullLabelString) + m_closeButton->sizeHint().width() + style()->pixelMetric(QStyle::PM_LayoutLeftMargin) * 2 + style()->pixelMetric(QStyle::PM_LayoutRightMargin) * 2 < width()) {
 127         m_label->setText(m_fullLabelString);
 128     } else {
 129         m_label->setText(m_shortLabelString);
 130     }
 131 }