ENH: Replace complicated arrow QPushButton with simpler QToolButton

QToolButton::ArrowType does what we want here.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@14693 3bd1e089-480b-0410-8dfb-8563597acbee

Libs/qMRMLWidgets/Resources/UI/qMRMLSliceControllerWidget.ui

@@ -30,7 +30,13 @@
     <number>0</number>
    </property>
    <item>
-    <widget class="QPushButton" name="SliceCollapsibleButton">
+    <widget class="QToolButton" name="SliceCollapsibleButton">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
      <property name="minimumSize">
       <size>
        <width>0</width>
@@ -44,10 +50,10 @@
       </size>
      </property>
      <property name="text">
-      <string/>
+      <string>...</string>
      </property>
-     <property name="checked">
-      <bool>false</bool>
+     <property name="arrowType">
+      <enum>Qt::DownArrow</enum>
      </property>
     </widget>
    </item>

Libs/qMRMLWidgets/qMRMLSliceControllerWidget.cxx

@@ -52,7 +52,7 @@ qMRMLSliceControllerWidgetPrivate::qMRMLSliceControllerWidgetPrivate()
 qMRMLSliceControllerWidgetPrivate::~qMRMLSliceControllerWidgetPrivate()
 {
 }
-
+/*
 //-----------------------------------------------------------------------------
 class qMRMLSliceCollapsibleButtonStyle:public QProxyStyle
 {
@@ -79,7 +79,7 @@ public:
       }
   }
 };
-
+*/
 //---------------------------------------------------------------------------
 void qMRMLSliceControllerWidgetPrivate::setupUi(qMRMLWidget* widget)
 {
@@ -88,7 +88,7 @@ void qMRMLSliceControllerWidgetPrivate::setupUi(qMRMLWidget* widget)
   this->Ui_qMRMLSliceControllerWidget::setupUi(widget);
 
   // Set a ProxyStyle responsible for drawing the arrow
-  this->SliceCollapsibleButton->setStyle(new qMRMLSliceCollapsibleButtonStyle(p->style()));
+  //this->SliceCollapsibleButton->setStyle(new qMRMLSliceCollapsibleButtonStyle(p->style()));
   
   // Set selector attributes
   this->LabelMapSelector->addAttribute("vtkMRMLVolumeNode", "LabelMap", "1");
@@ -140,7 +140,10 @@ void qMRMLSliceControllerWidgetPrivate::onImageDataModifiedEvent()
 // --------------------------------------------------------------------------
 void qMRMLSliceControllerWidgetPrivate::toggleControllerWidgetGroupVisibility()
 {
-  this->ControllerWidgetGroup->setVisible(!this->ControllerWidgetGroup->isVisible());
+  this->ControllerWidgetGroup->setVisible(
+    !this->ControllerWidgetGroup->isVisible());
+  this->SliceCollapsibleButton->setArrowType(
+    this->ControllerWidgetGroup->isVisible() ? Qt::UpArrow : Qt::DownArrow);
 }
 
 // --------------------------------------------------------------------------