Add Selection Mode

The selection mode action is a checkable toggle action named
"Select Files and Folders" which has "Space" as the default
shortcut.

In selection mode a bottom bar with contextual actions is shown.
These should mostly mirror the actions which are available through
the right-click context menu aka DolphinContextMenu.

Resizing of the window might make a overflow button appear in the
bottom selection mode bar.

This commit makes press and hold in the view activate selection
mode. This behaviour is not triggered if the press and hold is
used to either start a rubberband selection or a drag operation
within a short time. The length of the short timeframe is defined
by a QStyleHint. This is currently not implemented in touch
because I can't test it.

Mix the selection mode bars' background colors using a nice
combination of colors from the current color scheme

BUG: 427202

1 files changed, 21 insertions, 1 deletions

diff --git a/src/dolphinviewcontainer.h b/src/dolphinviewcontainer.h
index 057e47149..a0936efd3 100644
--- a/src/dolphinviewcontainer.h
+++ b/src/dolphinviewcontainer.h
@@ -9,6 +9,7 @@
 
 #include "config-dolphin.h"
 #include "dolphinurlnavigator.h"
+#include "selectionmode/selectionmodebottombar.h"
 #include "views/dolphinview.h"
 
 #include <KFileItem>
@@ -27,9 +28,12 @@ namespace KActivities {
 
 class FilterBar;
 class KMessageWidget;
+class QAction;
+class QGridLayout;
 class QUrl;
 class DolphinSearchBox;
 class DolphinStatusBar;
+class SelectionModeTopBar;
 
 /**
  * @short Represents a view for the directory content
@@ -131,6 +135,9 @@ public:
      */
     void disconnectUrlNavigator();
 
+    void setSelectionModeEnabled(bool enabled, KActionCollection *actionCollection = nullptr, SelectionModeBottomBar::Contents bottomBarContents = SelectionModeBottomBar::Contents::GeneralContents);
+    bool isSelectionModeEnabled() const;
+
     /**
      * Shows the message \msg with the given type non-modal above
      * the view-content.
@@ -206,6 +213,9 @@ public Q_SLOTS:
      */
     void setSearchModeEnabled(bool enabled);
 
+    /** Used to notify the m_selectionModeBottomBar that there is no other ViewContainer in the tab. */
+    void slotSplitTabDisabled();
+
 Q_SIGNALS:
     /**
      * Is emitted whenever the filter bar has changed its visibility state.
@@ -216,6 +226,8 @@ Q_SIGNALS:
      */
     void searchModeEnabledChanged(bool enabled);
 
+    void selectionModeChanged(bool enabled);
+
     /**
      * Is emitted when the write state of the folder has been changed. The application
      * should disable all actions like "Create New..." that depend on the write
@@ -395,7 +407,7 @@ private:
     void tryRestoreViewState();
 
 private:
-    QVBoxLayout* m_topLayout;
+    QGridLayout *m_topLayout;
 
     /**
      * The internal UrlNavigator which is never visible to the user.
@@ -410,14 +422,22 @@ private:
      * Otherwise it's one of the UrlNavigators visible in the toolbar.
      */
     QPointer<DolphinUrlNavigator> m_urlNavigatorConnected;
+
     DolphinSearchBox* m_searchBox;
     bool m_searchModeEnabled;
+
     KMessageWidget* m_messageWidget;
 
+    /// A bar shown at the top of the view to signify that selection mode is currently active.
+    SelectionModeTopBar *m_selectionModeTopBar;
+
     DolphinView* m_view;
 
     FilterBar* m_filterBar;
 
+    /// A bar shown at the bottom of the view whose contents depend on what the user is currently doing.
+    SelectionModeBottomBar *m_selectionModeBottomBar;
+
     DolphinStatusBar* m_statusBar;
     QTimer* m_statusBarTimer;            // Triggers a delayed update
     QElapsedTimer m_statusBarTimestamp;  // Time in ms since last update