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Full Screen GUI Development
Pt 2 ?More Controls & Text
By Jim (Machaira) Perry
Welcome back! If you抮e saying 揌uh?!?then you probably haven抰 read the first part of this tutorial. Please read it before continuing because we抣l be building on it.
Download this tutorial (in Word format) and the sample projects in a zip file (40 KB)
First Up
Let抯 build on our base window by adding the standard Minimize, Maximize/Restore, and Close buttons (see WindowSample3 project).
We抳e added enums for the new buttons:
CloseBtn
MinBtn
MaxBtn
RestoreBtn
created bitmaps for them (close.bmp, minimize.bmp, maximize.bmp, and restore.bmp), and added instances of the clsWindow class in the modDirectDraw module to create them:
Public WithEvents CloseButton As New clsWindow
Public WithEvents MinButton As New clsWindow
Public WithEvents MaxButton As New clsWindow
Public WithEvents RestoreButton As New clsWindow
Notice that we抳e added WithEvents to the declarations. This will allow us to do things outside of the class when the control is clicked. We抣l go over this a little later.
New controls mean that we have to add them as child controls to the base window object. We抳e done this in the CreateWindowObjects function, setting the necessary properties for them:
With frmMain.CloseButton
.ObjectType = CloseBtn
.ParentHeight = frmMain.Window.Height
.ParentWidth = frmMain.Window.Width
.ParentX = frmMain.Window.X
.ParentY = frmMain.Window.Y
.ObjectSurface = objDD.CreateSurfaceFromFile(App.Path & "\close.bmp", ddsdSurf4)
.WindowName = "CloseBtn"
End With
frmMain.Window.AddChild frmMain.CloseButton
With frmMain.MinimizeButton
.ObjectType = MinBtn
.ParentHeight = frmMain.Window.Height
.ParentWidth = frmMain.Window.Width
.ParentX = frmMain.Window.X
.ParentY = frmMain.Window.Y
.ObjectSurface = objDD.CreateSurfaceFromFile(App.Path & "\minimize.bmp", ddsdSurf4)
.WindowName = "MinBtn"
End With
frmMain.Window.AddChild frmMain.MinimizeButton
With frmMain.MaximizeButton
.ObjectType = MaxBtn
.ParentHeight = frmMain.Window.Height
.ParentWidth = frmMain.Window.Width
.ParentX = frmMain.Window.X
.ParentY = frmMain.Window.Y
.ObjectSurface = objDD.CreateSurfaceFromFile(App.Path & "\maximize.bmp", ddsdSurf4)
.WindowName = "MaxBtn"
End With
frmMain.Window.AddChild frmMain.MaximizeButton
With frmMain.RestoreButton
.ObjectType = RestoreBtn
.ParentHeight = frmMain.Window.Height
.ParentWidth = frmMain.Window.Width
.ParentX = frmMain.Window.X
.ParentY = frmMain.Window.Y
.ObjectSurface = objDD.CreateSurfaceFromFile(App.Path & "\restore.bmp", ddsdSurf4)
.WindowName = "RestoreBtn"
End With
frmMain.Window.AddChild frmMain.RestoreButton
This is code that used to be in the InitDD function, but has been moved out for a good reason, as you抣l see soon. It allows us to recreate the base window object and all children whenever we want. Notice also that we抳e changed the code to use the With匛ndWIth statements. It抯 saves our poor little fingers from having to type as much and speeds up the code a bit (not that it抣l be noticeable unless you timed it.
If you compare this chunk of code with the code to create the OK button, you抣l notice that we抮e not setting any X and Y or ObjectState properties for the buttons. That抯 because you can抰. The buttons only go in one place, the standard position on the window they抮e attached to. The properties are set in the ObjectSurface Property Set method:
Case MinBtn
iHeight = ddsd.lHeight / 2
iX = iParentWidth + iParentX - iWidth - 40
iY = iParentY + 7
iObjectState = iEnabled
Case MaxBtn
iHeight = ddsd.lHeight / 2
iX = iParentWidth + iParentX - iWidth - 24
iY = iParentY + 7
iObjectState = iEnabled
Case CloseBtn
iHeight = ddsd.lHeight / 2
iX = iParentWidth + iParentX - iWidth - 6
iY = iParentY + 7
iObjectState = iEnabled
Case RestoreBtn
iHeight = ddsd.lHeight / 2
iX = iParentWidth + iParentX - iWidth - 24
iY = iParentY + 7
iObjectState = iEnabled
The DrawObject function is also modified to handle drawing the new controls:
Case MinBtn, MaxBtn, CloseBtn, RestoreBtn
rectObject.Left = 0
rectObject.Right = iWidth
Select Case iObjectState
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