Details view: Optionally remember user changed column-widths

If the user changed a column-width in the details-view, up to now
the width got reset when changing a directory or when restarting
Dolphin. Now the column-widths automatically get remembered for each
directory in case if the user has modified the width. The automatic
resizing is still turn on per default. The storing of the custom
column-width can easily be reset by right clicking on the header and
selecting "Automatic Column Widths" from the context-menu.

Some finetuning is still necessary (e.g. the "Adjust View Properties"
dialog currently is not aware about this setting) but this will
be fixed during the next weeks.

BUG: 264434
FIXED-IN: 4.9.0

1 files changed, 15 insertions, 11 deletions

diff --git a/src/kitemviews/kitemlistwidget.cpp b/src/kitemviews/kitemlistwidget.cpp
index 951fb396c..b91e87167 100644
--- a/src/kitemviews/kitemlistwidget.cpp
+++ b/src/kitemviews/kitemlistwidget.cpp
@@ -44,7 +44,7 @@ KItemListWidget::KItemListWidget(QGraphicsItem* parent) :
     m_enabledSelectionToggle(false),
     m_data(),
     m_visibleRoles(),
-    m_visibleRolesSizes(),
+    m_columnWidths(),
     m_styleOption(),
     m_siblingsInfo(),
     m_hoverOpacity(0),
@@ -177,18 +177,20 @@ QList<QByteArray> KItemListWidget::visibleRoles() const
     return m_visibleRoles;
 }
 
-void KItemListWidget::setVisibleRolesSizes(const QHash<QByteArray, QSizeF> rolesSizes)
-{
-    const QHash<QByteArray, QSizeF> previousRolesSizes = m_visibleRolesSizes;
-    m_visibleRolesSizes = rolesSizes;
 
-    visibleRolesSizesChanged(rolesSizes, previousRolesSizes);
-    update();
+void KItemListWidget::setColumnWidth(const QByteArray& role, qreal width)
+{
+    if (m_columnWidths.value(role) != width) {
+        const qreal previousWidth = width;
+        m_columnWidths.insert(role, width);
+        columnWidthChanged(role, width, previousWidth);
+        update();
+    }
 }
 
-QHash<QByteArray, QSizeF> KItemListWidget::visibleRolesSizes() const
+qreal KItemListWidget::columnWidth(const QByteArray& role) const
 {
-    return m_visibleRolesSizes;
+    return m_columnWidths.value(role);
 }
 
 void KItemListWidget::setStyleOption(const KItemListStyleOption& option)
@@ -352,9 +354,11 @@ void KItemListWidget::visibleRolesChanged(const QList<QByteArray>& current,
     Q_UNUSED(previous);
 }
 
-void KItemListWidget::visibleRolesSizesChanged(const QHash<QByteArray, QSizeF>& current,
-                                               const QHash<QByteArray, QSizeF>& previous)
+void KItemListWidget::columnWidthChanged(const QByteArray& role,
+                                         qreal current,
+                                         qreal previous)
 {
+    Q_UNUSED(role);
     Q_UNUSED(current);
     Q_UNUSED(previous);
 }