- Fix crash found while investigating https://bugs.kde.org/show_bug.cgi?id=170927

[dolphin.git] / src / selectiontoggle.cpp

diff --git a/src/selectiontoggle.cpp b/src/selectiontoggle.cpp
index 244f51583337fcace519d27e48039e4b64036dcb..b9b79def01af8f2834936e2e85909ccac59d03c7 100644 (file)
--- a/src/selectiontoggle.cpp
+++ b/src/selectiontoggle.cpp
@@ -19,32 +19,33 @@
 
 #include "selectiontoggle.h"
 
+#include <kglobalsettings.h>
 #include <kicon.h>
 #include <kiconloader.h>
 #include <kiconeffect.h>
+#include <klocale.h>
 
 #include <QPainter>
 #include <QPaintEvent>
 #include <QRect>
 #include <QTimer>
-
-#include <kdebug.h>
+#include <QTimeLine>
 
 SelectionToggle::SelectionToggle(QWidget* parent) :
     QAbstractButton(parent),
-    m_showIcon(false),
     m_isHovered(false),
+    m_fadingValue(0),
     m_icon(),
-    m_timer(0)
+    m_fadingTimeLine(0)
 {
+    setFocusPolicy(Qt::NoFocus);
     parent->installEventFilter(this);
     resize(sizeHint());
-    m_icon = KIconLoader::global()->loadIcon("dialog-ok",
-                                             KIconLoader::NoGroup,
-                                             KIconLoader::SizeSmall);
-    m_timer = new QTimer(this);
-    connect(m_timer, SIGNAL(timeout()),
-            this, SLOT(showIcon()));
+    setIconOverlay(isChecked());
+    connect(this, SIGNAL(toggled(bool)),
+            this, SLOT(setIconOverlay(bool)));
+    connect(KGlobalSettings::self(), SIGNAL(iconChanged(int)),
+            this, SLOT(refreshIcon()));
 }
 
 SelectionToggle::~SelectionToggle()
@@ -56,15 +57,34 @@ QSize SelectionToggle::sizeHint() const
     return QSize(16, 16);
 }
 
+void SelectionToggle::reset()
+{
+    m_url = KUrl();
+    hide();
+}
+
+void SelectionToggle::setUrl(const KUrl& url)
+{
+    m_url = url;
+    if (!url.isEmpty()) {
+        startFading();
+    }
+}
+
+KUrl SelectionToggle::url() const
+{
+    return m_url;
+}
+
 void SelectionToggle::setVisible(bool visible)
 {
     QAbstractButton::setVisible(visible);
+
+    stopFading();
     if (visible) {
-        m_timer->start(1000);
-    } else {
-        m_timer->stop();
-        m_showIcon = false;
+        startFading();
     }
+
 }
 
 bool SelectionToggle::eventFilter(QObject* obj, QEvent* event)
@@ -78,8 +98,16 @@ bool SelectionToggle::eventFilter(QObject* obj, QEvent* event)
 void SelectionToggle::enterEvent(QEvent* event)
 {
     QAbstractButton::enterEvent(event);
+
+    // if the mouse cursor is above the selection toggle, display
+    // it immediately without fading timer
     m_isHovered = true;
-    m_showIcon = true;
+    if (m_fadingTimeLine != 0) {
+        m_fadingTimeLine->stop();
+    }
+    m_fadingValue = 255;
+    setToolTip(isChecked() ? i18nc("@info:tooltip", "Deselect Item") :
+                             i18nc("@info:tooltip", "Select Item"));
     update();
 }
 
@@ -94,20 +122,91 @@ void SelectionToggle::paintEvent(QPaintEvent* event)
 {
     QPainter painter(this);
     painter.setClipRect(event->rect());
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    // draw an alpha blended circle as background
+    const QPalette& palette = parentWidget()->palette();
+
+    const QBrush& backgroundBrush = palette.brush(QPalette::Normal, QPalette::Window);
+    QColor background = backgroundBrush.color();
+    background.setAlpha(m_fadingValue / 2);
+    painter.setBrush(background);
+
+    const QBrush& foregroundBrush = palette.brush(QPalette::Normal, QPalette::WindowText);
+    QColor foreground = foregroundBrush.color();
+    foreground.setAlpha(m_fadingValue / 4);
+    painter.setPen(foreground);
 
+    painter.drawEllipse(0, 0, width(), height());
+
+    // draw the icon overlay
     if (m_isHovered) {
         KIconEffect iconEffect;
         QPixmap activeIcon = iconEffect.apply(m_icon, KIconLoader::Desktop, KIconLoader::ActiveState);
         painter.drawPixmap(0, 0, activeIcon);
-    } else if (m_showIcon) {
-        painter.drawPixmap(0, 0, m_icon);
+    } else {
+        if (m_fadingValue < 255) {
+            // apply an alpha mask respecting the fading value to the icon
+            QPixmap icon = m_icon;
+            QPixmap alphaMask(icon.width(), icon.height());
+            const QColor color(m_fadingValue, m_fadingValue, m_fadingValue);
+            alphaMask.fill(color);
+            icon.setAlphaChannel(alphaMask);
+            painter.drawPixmap(0, 0, icon);
+        } else {
+            // no fading is required
+            painter.drawPixmap(0, 0, m_icon);
+        }
     }
 }
 
-void SelectionToggle::showIcon()
+void SelectionToggle::setFadingValue(int value)
 {
-    m_showIcon = true;
+    m_fadingValue = value;
+    if (m_fadingValue >= 255) {
+        Q_ASSERT(m_fadingTimeLine != 0);
+        m_fadingTimeLine->stop();
+    }
     update();
 }
 
+void SelectionToggle::setIconOverlay(bool checked)
+{
+    const char* icon = checked ? "list-remove" : "list-add";
+    m_icon = KIconLoader::global()->loadIcon(icon,
+                                             KIconLoader::NoGroup,
+                                             KIconLoader::SizeSmall);
+    update();
+}
+
+void SelectionToggle::refreshIcon()
+{
+    setIconOverlay(isChecked());
+}
+
+void SelectionToggle::startFading()
+{
+    Q_ASSERT(m_fadingTimeLine == 0);
+
+    const bool animate = KGlobalSettings::graphicEffectsLevel() & KGlobalSettings::SimpleAnimationEffects;
+    const int duration = animate ? 600 : 1;
+
+    m_fadingTimeLine = new QTimeLine(duration, this);
+    connect(m_fadingTimeLine, SIGNAL(frameChanged(int)),
+            this, SLOT(setFadingValue(int)));
+    m_fadingTimeLine->setFrameRange(0, 255);
+    m_fadingTimeLine->start();
+    m_fadingValue = 0;
+}
+
+void SelectionToggle::stopFading()
+{
+    if (m_fadingTimeLine != 0) {
+        m_fadingTimeLine->stop();
+        delete m_fadingTimeLine;
+        m_fadingTimeLine = 0;
+    }
+    m_fadingValue = 0;
+}
+
 #include "selectiontoggle.moc"