private static void OnDataGridContextChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { GroupLevelIndicatorPane self = sender as GroupLevelIndicatorPane; if (self != null) { DataGridContext dataGridContext = e.OldValue as DataGridContext; //unregister to the old contexts Collection GroupDescriptions Changed event if (dataGridContext != null) { CollectionChangedEventManager.RemoveListener(dataGridContext.Items.GroupDescriptions, self); } dataGridContext = e.NewValue as DataGridContext; //register to the new contexts Collection GroupDescriptions Changed event if (dataGridContext != null) { CollectionChangedEventManager.AddListener(dataGridContext.Items.GroupDescriptions, self); self.PrepareDefaultStyleKey(dataGridContext.DataGridControl.GetView()); } self.InvalidateMeasure(); } }
protected override Size MeasureOverride(Size availableSize) { Panel panel = this.GroupLevelIndicatorPaneHost; if (panel != null) { DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this); if (dataGridContext != null) { if (this.GroupLevelIndicatorPaneNeedsRefresh) { //clear all the panel's children! panel.Children.Clear(); DataGridContext previousContext = dataGridContext; DataGridContext runningDataGridContext = dataGridContext.ParentDataGridContext; while (runningDataGridContext != null) { //create a GroupLevelIndicator to create indentation between the GLIPs FrameworkElement newGroupMargin = null; newGroupMargin = new DetailIndicator(); newGroupMargin.DataContext = dataGridContext; object bindingSource = dataGridContext.GetDefaultDetailConfigurationForContext(); if (bindingSource == null) { bindingSource = dataGridContext.SourceDetailConfiguration; } //Bind the GroupLevelIndicator`s style to the running DataGridContext`s GroupLevelIndicatorStyle. Binding groupLevelIndicatorStyleBinding = new Binding(); groupLevelIndicatorStyleBinding.Path = new PropertyPath(DetailConfiguration.DetailIndicatorStyleProperty); groupLevelIndicatorStyleBinding.Source = bindingSource; newGroupMargin.SetBinding(StyleProperty, groupLevelIndicatorStyleBinding); //insert the Spacer GroupLevelIndicator in the panel panel.Children.Insert(0, newGroupMargin); if (!runningDataGridContext.AreDetailsFlatten) { //then create the GLIP for the running DataGridContext GroupLevelIndicatorPane newSubGLIP = new GroupLevelIndicatorPane(); DataGridControl.SetDataGridContext(newSubGLIP, runningDataGridContext); newSubGLIP.SetIsLeaf(false); GroupLevelIndicatorPane.SetGroupLevel(newSubGLIP, -1); //and insert it in the panel. panel.Children.Insert(0, newSubGLIP); } previousContext = runningDataGridContext; runningDataGridContext = runningDataGridContext.ParentDataGridContext; } //end of the loop to cycle through the parent contexts. } // end if GroupLevelIndicatorPaneNeedsRefresh } // end if dataGridContext != null } //end if panel is not null return(base.MeasureOverride(availableSize)); }
protected override Size MeasureOverride(Size availableSize) { var panel = this.GroupLevelIndicatorPaneHost; var dataGridContext = DataGridControl.GetDataGridContext(this); if ((panel == null) || (dataGridContext == null)) { return(base.MeasureOverride(availableSize)); } var groupDescriptions = DataGridContext.GetGroupDescriptionsHelper(dataGridContext.Items); var leafGroupLevel = GroupLevelIndicatorPane.GetGroupLevel(this); // If Indented is true (default), we use the total groupDescriptions.Count for this DataGridContext var correctedGroupLevel = (this.Indented == true) ? groupDescriptions.Count : leafGroupLevel; // Ensure that the GroupLevel retrieved does not eNequeos the number of group descriptions for the DataGridContext correctedGroupLevel = System.Math.Min(correctedGroupLevel, groupDescriptions.Count); // Then finally, if the GroupLevel is -1, then indent at maximum. if (correctedGroupLevel == -1) { correctedGroupLevel = groupDescriptions.Count; } if ((correctedGroupLevel > 0) && (this.AreGroupsFlattened)) { correctedGroupLevel = (this.Indented) ? 1 : 0; } var children = panel.Children; var childrenCount = children.Count; // If we need to add/remove GroupLevelIndicators from the panel if (correctedGroupLevel != childrenCount) { // When grouping change, we take for granted that the group deepness will change, // so we initialize DataContext of the margin only in there. // Clear all the panel's children! children.Clear(); // Create 1 group margin content presenter for each group level for (int i = correctedGroupLevel - 1; i >= 0; i--) { GroupLevelIndicator groupMargin = new GroupLevelIndicator(); groupMargin.DataContext = dataGridContext.GroupLevelDescriptions[i]; children.Insert(0, new GroupLevelIndicator()); } childrenCount = correctedGroupLevel; this.SetCurrentIndicatorCount(childrenCount); this.InvalidateGroupLevelIndicatorPaneHostPanelMeasure(); } var item = dataGridContext.GetItemFromContainer(this); for (int i = 0; i < childrenCount; i++) { GroupLevelIndicator groupMargin = children[i] as GroupLevelIndicator; CollectionViewGroup groupForIndicator = GroupLevelIndicatorPane.GetCollectionViewGroupHelper( dataGridContext, groupDescriptions, item, i); GroupConfiguration groupLevelConfig = GroupConfiguration.GetGroupConfiguration( dataGridContext, groupDescriptions, dataGridContext.GroupConfigurationSelector, i, groupForIndicator); if (groupLevelConfig != null) { Binding groupLevelIndicatorStyleBinding = BindingOperations.GetBinding(groupMargin, GroupLevelIndicator.StyleProperty); if ((groupLevelIndicatorStyleBinding == null) || (groupLevelIndicatorStyleBinding.Source != groupLevelConfig)) { groupLevelIndicatorStyleBinding = new Binding("GroupLevelIndicatorStyle"); groupLevelIndicatorStyleBinding.Source = groupLevelConfig; // Use a Converter to manage groupLevelConfig.GroupLevelIndicatorStyle == null // so that an implicit syle won't be overriden by a null style. groupLevelIndicatorStyleBinding.Converter = new GroupLevelIndicatorConverter(); groupLevelIndicatorStyleBinding.ConverterParameter = groupMargin; groupMargin.SetBinding(GroupLevelIndicator.StyleProperty, groupLevelIndicatorStyleBinding); } } else { groupMargin.ClearValue(GroupLevelIndicator.StyleProperty); } // If the ShowIndicators property is False or there is already leafGroupLevel GroupLevelIndicators in the panel, // the current newGroupMargin must be hidden. if ((!GroupLevelIndicatorPane.GetShowIndicators(this)) || ((i >= leafGroupLevel) && (leafGroupLevel != -1))) { groupMargin.Visibility = Visibility.Hidden; } else { groupMargin.Visibility = Visibility.Visible; } } return(base.MeasureOverride(availableSize)); }