src/selectionmode/topbar.cpp

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