Allow zooming in and zooming out in the icons view.

svn path=/trunk/KDE/kdebase/apps/; revision=638386

7 files changed, 143 insertions, 14 deletions

diff --git a/src/dolphincontroller.cpp b/src/dolphincontroller.cpp
index e1d4c48e3..ea9c25211 100644
--- a/src/dolphincontroller.cpp
+++ b/src/dolphincontroller.cpp
@@ -21,7 +21,9 @@
 
 DolphinController::DolphinController(QObject* parent) :
     QObject(parent),
-    m_showPreview(false)
+    m_showPreview(false),
+    m_zoomInPossible(false),
+    m_zoomOutPossible(false)
 {
 }
 
@@ -65,6 +67,16 @@ void DolphinController::setShowPreview(bool showPreview)
     }
 }
 
+void DolphinController::triggerZoomIn()
+{
+    emit zoomIn();
+}
+
+void DolphinController::triggerZoomOut()
+{
+    emit zoomOut();
+}
+
 void DolphinController::triggerItem(const QModelIndex& index)
 {
     emit itemTriggered(index);
diff --git a/src/dolphincontroller.h b/src/dolphincontroller.h
index 08d12ea57..1bd283fd4 100644
--- a/src/dolphincontroller.h
+++ b/src/dolphincontroller.h
@@ -70,6 +70,14 @@ public:
     void setShowPreview(bool showPreview);
     bool showPreview() const { return m_showPreview; }
 
+    void triggerZoomIn();
+    void setZoomInPossible(bool possible) { m_zoomInPossible = possible; }
+    bool isZoomInPossible() const { return m_zoomInPossible; }
+
+    void triggerZoomOut();
+    void setZoomOutPossible(bool possible) { m_zoomOutPossible = possible; }
+    bool isZoomOutPossible() const { return m_zoomOutPossible; }
+
 public slots:
     void triggerItem(const QModelIndex& index);
     void indicateSelectionChange();
@@ -121,8 +129,16 @@ signals:
     /** Is emitted if the selection has been changed by the user. */
     void selectionChanged();
 
+    /** Is emitted if the view should zoom in. */
+    void zoomIn();
+
+    /** Is emitted if the view should zoom out. */
+    void zoomOut();
+
 private:
     bool m_showPreview;
+    bool m_zoomInPossible;
+    bool m_zoomOutPossible;
     KUrl m_url;
 };
 
diff --git a/src/dolphiniconsview.cpp b/src/dolphiniconsview.cpp
index 1695b768e..ef4525065 100644
--- a/src/dolphiniconsview.cpp
+++ b/src/dolphiniconsview.cpp
@@ -24,7 +24,6 @@
 
 #include "dolphin_iconsmodesettings.h"
 
-#include <assert.h>
 #include <kdirmodel.h>
 #include <kfileitem.h>
 #include <kfileitemdelegate.h>
@@ -43,15 +42,18 @@ DolphinIconsView::DolphinIconsView(QWidget* parent, DolphinController* controlle
             controller, SLOT(triggerItem(const QModelIndex&)));
     connect(controller, SIGNAL(showPreviewChanged(bool)),
             this, SLOT(updateGridSize(bool)));
+    connect(controller, SIGNAL(zoomIn()),
+            this, SLOT(zoomIn()));
+    connect(controller, SIGNAL(zoomOut()),
+            this, SLOT(zoomOut()));
 
     // apply the icons mode settings to the widget
     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
     Q_ASSERT(settings != 0);
 
-    setSpacing(settings->gridSpacing());
-
     m_viewOptions = QListView::viewOptions();
     m_viewOptions.font = QFont(settings->fontFamily(), settings->fontSize());
+
     updateGridSize(controller->showPreview());
 
     if (settings->arrangement() == QListView::TopToBottom) {
@@ -132,6 +134,91 @@ void DolphinIconsView::updateGridSize(bool showPreview)
 
     m_viewOptions.decorationSize = QSize(size, size);
     setGridSize(QSize(gridWidth, gridHeight));
+
+    m_controller->setZoomInPossible(isZoomInPossible());
+    m_controller->setZoomOutPossible(isZoomOutPossible());
+}
+
+void DolphinIconsView::zoomIn()
+{
+    if (isZoomInPossible()) {
+        IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
+
+        const bool showPreview = m_controller->showPreview();
+        if (showPreview) {
+            const int previewSize = increasedIconSize(settings->previewSize());
+            settings->setPreviewSize(previewSize);
+        }
+        else {
+            const int iconSize = increasedIconSize(settings->iconSize());
+            settings->setIconSize(iconSize);
+        }
+
+        updateGridSize(showPreview);
+    }
+}
+
+void DolphinIconsView::zoomOut()
+{
+    if (isZoomOutPossible()) {
+        IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
+
+        const bool showPreview = m_controller->showPreview();
+        if (showPreview) {
+            const int previewSize = decreasedIconSize(settings->previewSize());
+            settings->setPreviewSize(previewSize);
+        }
+        else {
+            const int iconSize = decreasedIconSize(settings->iconSize());
+            settings->setIconSize(iconSize);
+        }
+
+        updateGridSize(showPreview);
+    }
+}
+
+bool DolphinIconsView::isZoomInPossible() const
+{
+    IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
+    const int size = m_controller->showPreview() ? settings->previewSize() : settings->iconSize();
+    return size < K3Icon::SizeEnormous;
+}
+
+bool DolphinIconsView::isZoomOutPossible() const
+{
+    IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
+    const int size = m_controller->showPreview() ? settings->previewSize() : settings->iconSize();
+    return size > K3Icon::SizeSmall;
+}
+
+int DolphinIconsView::increasedIconSize(int size) const
+{
+    // TODO: get rid of K3Icon sizes
+    int incSize = 0;
+    switch (size) {
+        case K3Icon::SizeSmall:       incSize = K3Icon::SizeSmallMedium; break;
+        case K3Icon::SizeSmallMedium: incSize = K3Icon::SizeMedium; break;
+        case K3Icon::SizeMedium:      incSize = K3Icon::SizeLarge; break;
+        case K3Icon::SizeLarge:       incSize = K3Icon::SizeHuge; break;
+        case K3Icon::SizeHuge:        incSize = K3Icon::SizeEnormous; break;
+        default: Q_ASSERT(false); break;
+    }
+    return incSize;
+}
+
+int DolphinIconsView::decreasedIconSize(int size) const
+{
+    // TODO: get rid of K3Icon sizes
+    int decSize = 0;
+    switch (size) {
+        case K3Icon::SizeSmallMedium: decSize = K3Icon::SizeSmall; break;
+        case K3Icon::SizeMedium: decSize = K3Icon::SizeSmallMedium; break;
+        case K3Icon::SizeLarge: decSize = K3Icon::SizeMedium; break;
+        case K3Icon::SizeHuge: decSize = K3Icon::SizeLarge; break;
+        case K3Icon::SizeEnormous: decSize = K3Icon::SizeHuge; break;
+        default: Q_ASSERT(false); break;
+    }
+    return decSize;
 }
 
 #include "dolphiniconsview.moc"
diff --git a/src/dolphiniconsview.h b/src/dolphiniconsview.h
index 22da7de21..db3d5d6cd 100644
--- a/src/dolphiniconsview.h
+++ b/src/dolphiniconsview.h
@@ -54,6 +54,19 @@ private slots:
      */
     void updateGridSize(bool showPreview);
 
+    void zoomIn();
+    void zoomOut();
+
+private:
+    bool isZoomInPossible() const;
+    bool isZoomOutPossible() const;
+
+    /** Returns the increased icon size for the size \a size. */
+    int increasedIconSize(int size) const;
+
+    /** Returns the decreased icon size for the size \a size. */
+    int decreasedIconSize(int size) const;
+
 private:
     DolphinController* m_controller;
     QStyleOptionViewItem m_viewOptions;
diff --git a/src/dolphinmainwindow.cpp b/src/dolphinmainwindow.cpp
index edb57ef7f..491411cb2 100644
--- a/src/dolphinmainwindow.cpp
+++ b/src/dolphinmainwindow.cpp
@@ -250,11 +250,11 @@ void DolphinMainWindow::slotViewModeChanged()
     updateViewActions();

 }

 

-void DolphinMainWindow::slowShowPreviewChanged()

+void DolphinMainWindow::slotShowPreviewChanged()

 {

-    KToggleAction* showPreviewAction =

-        static_cast<KToggleAction*>(actionCollection()->action("show_preview"));

-    showPreviewAction->setChecked(m_activeView->showPreview());

+    // It is not enough to update the 'Show Preview' action, also

+    // the 'Zoom In' and 'Zoom Out' actions must be adapted.

+    updateViewActions();

 }

 

 void DolphinMainWindow::slotShowHiddenFilesChanged()

@@ -329,6 +329,7 @@ void DolphinMainWindow::slotHistoryChanged()
 void DolphinMainWindow::slotUrlChanged(const KUrl& url)

 {

     updateEditActions();

+    updateViewActions();

     updateGoActions();

     setCaption(url.fileName());

 }

@@ -1349,7 +1350,7 @@ void DolphinMainWindow::connectViewSignals(int viewIndex)
     connect(view, SIGNAL(modeChanged()),

             this, SLOT(slotViewModeChanged()));

     connect(view, SIGNAL(showPreviewChanged()),

-            this, SLOT(slowShowPreviewChanged()));

+            this, SLOT(slotShowPreviewChanged()));

     connect(view, SIGNAL(showHiddenFilesChanged()),

             this, SLOT(slotShowHiddenFilesChanged()));

     connect(view, SIGNAL(sortingChanged(DolphinView::Sorting)),

diff --git a/src/dolphinmainwindow.h b/src/dolphinmainwindow.h
index 1b33c8cb0..137fdfc9e 100644
--- a/src/dolphinmainwindow.h
+++ b/src/dolphinmainwindow.h
@@ -320,7 +320,7 @@ private slots:
     void slotViewModeChanged();
 
     /** Updates the state of the 'Show preview' menu action. */
-    void slowShowPreviewChanged();
+    void slotShowPreviewChanged();
 
     /** Updates the state of the 'Show hidden files' menu action. */
     void slotShowHiddenFilesChanged();
diff --git a/src/dolphinview.cpp b/src/dolphinview.cpp
index 81eaf21b4..fd6b1409e 100644
--- a/src/dolphinview.cpp
+++ b/src/dolphinview.cpp
@@ -376,22 +376,22 @@ bool DolphinView::isUrlEditable() const
 
 void DolphinView::zoomIn()
 {
-    //itemEffectsManager()->zoomIn();
+    m_controller->triggerZoomIn();
 }
 
 void DolphinView::zoomOut()
 {
-    //itemEffectsManager()->zoomOut();
+    m_controller->triggerZoomOut();
 }
 
 bool DolphinView::isZoomInPossible() const
 {
-    return false; //itemEffectsManager()->isZoomInPossible();
+    return m_controller->isZoomInPossible();
 }
 
 bool DolphinView::isZoomOutPossible() const
 {
-    return false; //itemEffectsManager()->isZoomOutPossible();
+    return m_controller->isZoomOutPossible();
 }
 
 void DolphinView::setSorting(Sorting sorting)