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GridViewColumnHeaderExtender.vb
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GridViewColumnHeaderExtender.vb
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Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms
Imports DevExpress.Skins
Imports DevExpress.XtraGrid.Views.Grid
Imports System.Drawing
Imports DevExpress.XtraGrid.Views.Grid.ViewInfo
Imports DevExpress.XtraGrid.Drawing
Imports DevExpress.Utils.Drawing
Imports DevExpress.XtraGrid.Columns
Imports DevExpress.Utils
Imports System.ComponentModel
Namespace DXSample
Public Class GridViewColumnHeaderExtender
Inherits Component
Private _view As GridView = Nothing
Private ReadOnly checkBoxSize As Size
Private skipGlyph As Boolean = False
Public Property DrawCheckBoxByDefault() As Boolean
Private inHeader As Boolean = False
Private isCheckBoxCollectionInitialized As Boolean = False
Private glyphCollection As ImageCollection = Nothing
Private checkBoxCollection As ImageCollection = Nothing
Private column As GridColumn = Nothing
Public Sub New()
checkBoxSize = New Size(14, 14)
DrawCheckBoxByDefault = True
End Sub
Public Property View() As GridView
Get
Return _view
End Get
Set(ByVal value As GridView)
If _view Is value Then
Return
End If
OnViewChanging()
_view = value
OnViewChanged()
End Set
End Property
Protected Overridable Sub OnViewChanging()
ViewEvents(False)
End Sub
Protected Overridable Sub OnViewChanged()
ViewEvents(True)
End Sub
Private Sub OnMouseUp(ByVal sender As Object, ByVal e As MouseEventArgs)
If Not ColumnHeaderContainsCursor(e.Location) Then
Return
End If
If CheckBoxContainsCursor(e.Location, column) Then
ResetChecked(column)
SetCheckBoxState(column, ObjectState.Normal)
DXMouseEventArgs.GetMouseArgs(e).Handled = True
End If
End Sub
Private Sub OnMouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
If Not ColumnHeaderContainsCursor(e.Location) Then
Return
End If
Dim state As ObjectState = ObjectState.Normal
If CheckBoxContainsCursor(e.Location, column) Then
state = ObjectState.Hot
End If
SetCheckBoxState(column, state)
End Sub
Private Sub OnMouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
If Not ColumnHeaderContainsCursor(e.Location) Then
Return
End If
If CheckBoxContainsCursor(e.Location, column) Then
SetCheckBoxState(column, ObjectState.Pressed)
End If
End Sub
Private Sub view_MouseLeave(ByVal sender As Object, ByVal e As EventArgs)
If Not DrawCheckBoxByDefault AndAlso column IsNot Nothing Then
inHeader = False
_view.InvalidateColumnHeader(column)
End If
End Sub
Private Sub ResetChecked(ByVal col As GridColumn)
CheckColumnTag(column)
Dim temp As ColumnStateRepository = (TryCast(col.Tag, ColumnStateRepository))
temp.Checked = Not temp.Checked
RaiseColumnCheckedChanged(New ColumnCheckedChangedEventArgs(col, temp.Checked))
End Sub
Private Sub SetCheckBoxState(ByVal column As GridColumn, ByVal state As ObjectState)
CheckColumnTag(column)
TryCast(column.Tag, ColumnStateRepository).State = state
_view.InvalidateColumnHeader(column)
End Sub
Private Function ColumnHeaderContainsCursor(ByVal pt As Point) As Boolean
Dim hitInfo As GridHitInfo = _view.CalcHitInfo(pt)
column = hitInfo.Column
inHeader = hitInfo.HitTest = GridHitTest.Column
Return inHeader
End Function
Private Function CheckBoxContainsCursor(ByVal point As Point, ByVal col As GridColumn) As Boolean
Dim rect As Rectangle = CalcCheckBoxRectangle(col)
Return rect.Contains(point)
End Function
Private Function CalcCheckBoxRectangle(ByVal col As GridColumn) As Rectangle
GraphicsInfo.Default.AddGraphics(Nothing)
Dim viewInfo As GridViewInfo = TryCast(_view.GetViewInfo(), GridViewInfo)
Dim columnArgs As GridColumnInfoArgs = viewInfo.ColumnsInfo(col)
Dim rect As Rectangle
Try
rect = GetCheckBoxRectangle(columnArgs, GraphicsInfo.Default.Graphics)
Finally
GraphicsInfo.Default.ReleaseGraphics()
End Try
Return rect
End Function
Private Function GetCheckBoxRectangle(ByVal columnArgs As GridColumnInfoArgs, ByVal gr As Graphics) As Rectangle
Dim columnRect As Rectangle = columnArgs.Bounds
Dim innerElementsWidth As Integer = CalcInnerElementsMinWidth(columnArgs, gr)
Dim Rect As New Rectangle(columnRect.Right - innerElementsWidth - checkBoxSize.Width - 5, columnRect.Y + columnRect.Height \ 2 - checkBoxSize.Height \ 2, checkBoxSize.Width, checkBoxSize.Height)
Return Rect
End Function
Private Function CalcInnerElementsMinWidth(ByVal columnArgs As GridColumnInfoArgs, ByVal gr As Graphics) As Integer
Dim canDrawMode As Boolean = True
Return columnArgs.InnerElements.CalcMinSize(gr, canDrawMode).Width
End Function
Private Sub OnCustomDrawColumnHeader(ByVal sender As Object, ByVal e As ColumnHeaderCustomDrawEventArgs)
If e.Column Is Nothing Then
Return
End If
DefaultDrawColumnHeader(e)
If CanDrawCheckBox(e.Column) Then
DrawCheckBox(e)
End If
e.Handled = True
End Sub
Private Sub CheckColumnTag(ByVal col As GridColumn)
If col.Tag IsNot Nothing AndAlso col.Tag.GetType() Is GetType(ColumnStateRepository) Then
Return
End If
col.Tag = New ColumnStateRepository With {
.State = ObjectState.Normal,
.Checked = False
}
End Sub
Private Function CanDrawCheckBox(ByVal col As GridColumn) As Boolean
Return DrawCheckBoxByDefault OrElse (inHeader AndAlso col Is column)
End Function
Private Sub DrawCheckBox(ByVal e As ColumnHeaderCustomDrawEventArgs)
Dim index As Integer = 0
CheckColumnTag(e.Column)
Dim temp As ColumnStateRepository = (TryCast(e.Column.Tag, ColumnStateRepository))
Dim offset As Integer = If(temp.Checked = True, 4, 0)
Select Case temp.State
Case ObjectState.Normal
index = offset
Case ObjectState.Hot
index = offset + 1
Case ObjectState.Hot Or ObjectState.Pressed
index = offset + 2
End Select
Dim rect As Rectangle = CalcCheckBoxRectangle(e.Column)
CheckImageCollections()
CheckGlyphCollection()
e.Cache.DrawImage(checkBoxCollection.Images(index), rect)
If Not skipGlyph Then e.Cache.DrawImage(glyphCollection.Images(index), rect)
End Sub
Private Sub CheckImageCollections()
If checkBoxCollection Is Nothing Then checkBoxCollection = GetCheckBoxImages()
End Sub
Private Sub CheckGlyphCollection()
If Not skipGlyph AndAlso glyphCollection Is Nothing Then glyphCollection = GetGlyphImages()
End Sub
Protected Overridable Function GetCheckBoxImages() As ImageCollection
Dim skinElement As SkinElement = GetSkinElement()
If skinElement Is Nothing Then Return Nothing
Return skinElement.Image.GetImages()
End Function
Protected Overridable Function GetGlyphImages() As ImageCollection
Dim skinElement As SkinElement = GetSkinElement()
If skinElement Is Nothing Then Return Nothing
If skinElement.Glyph Is Nothing Then
skipGlyph = True
Return Nothing
End If
Return skinElement.Glyph.GetImages()
End Function
Private Shared Function GetSkinElement() As SkinElement
Dim skin As Skin = EditorsSkins.GetSkin(DevExpress.LookAndFeel.UserLookAndFeel.[Default])
Dim skinElement As SkinElement = skin("CheckBox")
Return skinElement
End Function
Private Sub DefaultDrawColumnHeader(ByVal e As ColumnHeaderCustomDrawEventArgs)
e.Painter.DrawObject(e.Info)
End Sub
Private Sub ViewEvents(ByVal subscribe As Boolean)
If _view Is Nothing Then
Return
End If
If Not subscribe Then
RemoveHandler _view.CustomDrawColumnHeader, AddressOf OnCustomDrawColumnHeader
RemoveHandler _view.MouseDown, AddressOf OnMouseDown
RemoveHandler _view.MouseUp, AddressOf OnMouseUp
RemoveHandler _view.MouseMove, AddressOf OnMouseMove
RemoveHandler _view.MouseLeave, AddressOf view_MouseLeave
Return
End If
AddHandler _view.CustomDrawColumnHeader, AddressOf OnCustomDrawColumnHeader
AddHandler _view.MouseDown, AddressOf OnMouseDown
AddHandler _view.MouseUp, AddressOf OnMouseUp
AddHandler _view.MouseMove, AddressOf OnMouseMove
AddHandler _view.MouseLeave, AddressOf view_MouseLeave
End Sub
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
ViewEvents(False)
View = Nothing
End If
MyBase.Dispose(disposing)
End Sub
Public Event ColumnCheckedChanged As EventHandler(Of ColumnCheckedChangedEventArgs)
Public Overridable Sub RaiseColumnCheckedChanged(ByVal ea As ColumnCheckedChangedEventArgs)
Dim handler As EventHandler(Of ColumnCheckedChangedEventArgs) = ColumnCheckedChangedEvent
If handler IsNot Nothing Then
handler(_view, ea)
End If
End Sub
End Class
End Namespace