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/Win/Drag and Drop/File Drag Multi
Required plugins for this example: MBS Main Plugin, MBS Picture Plugin, MBS Win Plugin
You find this example project in your Plugins Download as a Xojo project file within the examples folder: /Win/Drag and Drop/File Drag Multi
This example is the version from Sun, 17th Mar 2012.
Project "File Drag Multi.xojo_binary_project"
Class App Inherits Application
Const kEditClear = "&Löschen"
Const kFileQuit = "Beenden"
Const kFileQuitShortcut = ""
EventHandler Sub Open()
dim file100 as FolderItem = createtestfile(100)
dim file200 as FolderItem = createtestfile(200)
dim file500 as FolderItem = createtestfile(500)
dim filetext as FolderItem = CreateTextFile("test.txt", "Hello World"+EndOfLine+"Just a test file.")
files.Append file100
files.Append file200
files.Append file500
files.Append filetext
End EventHandler
Function CreateTestFile(n as integer) As FolderItem
dim logo as Picture = logoMBS(n)
dim file as FolderItem = SpecialFolder.Temporary.Child("test"+str(n)+".jpg")
file.SaveAsJPEG logo
Return file
End Function
Function CreateTextFile(filename as string, content as string) As FolderItem
dim file as FolderItem = SpecialFolder.Temporary.Child(filename)
dim t as TextOutputStream = file.CreateTextFile
if t<>Nil then
t.Write content
end if
Return file
End Function
Property files() As FolderItem
End Class
MenuBar MenuBar1
MenuItem FileMenu = "&Ablage"
MenuItem FileQuit = "#App.kFileQuit"
MenuItem EditMenu = "&Bearbeiten"
MenuItem EditUndo = "&Rückgängig"
MenuItem UntitledMenu1 = "-"
MenuItem EditCut = "&Ausschneiden"
MenuItem EditCopy = "&Kopieren"
MenuItem EditPaste = "&Einfügen"
MenuItem EditClear = "#App.kEditClear"
MenuItem UntitledMenu0 = "-"
MenuItem EditSelectAll = "&Alles auswählen"
End MenuBar
Class FileDragWindow Inherits Window
Control StaticText1 Inherits Label
ControlInstance StaticText1 Inherits Label
End Control
Control Canvas1 Inherits Canvas
ControlInstance Canvas1 Inherits Canvas
EventHandler Function MouseDown(X As Integer, Y As Integer) As Boolean
DragStarted = false
Return true
End EventHandler
EventHandler Sub MouseDrag(X As Integer, Y As Integer)
if UBound(app.files)>=0 and DragStarted = false then
DragStarted = true // avoid a new drag if the user pressed Escape key and is still dragging
dropsource = new FileDragSource
dim data as new WinDataObjectMBS(app.files)
dim DragImage as new Picture(me.Width, me.Height, 32)
drawicons DragImage.Graphics, &c000001
data.AddDragImage DragImage, DragImage.Width, DragImage.Height, x, y, &c000001
dim okeffect as integer = dropsource.DROPEFFECT_COPY // we allow only copy
dim effect as integer = 0
dim result as integer = dropsource.DoDragDrop(data, okeffect, effect)
// this is for debugging so we can look on results in DebugView:
System.DebugLog "Result: "+str(Result)
System.DebugLog "Effect: "+str(effect)
if result = dropsource.DRAGDROP_S_DROP then
System.DebugLog "Dropped"
if BitwiseAnd(Effect, dropsource.DROPEFFECT_COPY) = dropsource.DROPEFFECT_COPY then
System.DebugLog "Copied"
elseif BitwiseAnd(Effect, dropsource.DROPEFFECT_MOVE) = dropsource.DROPEFFECT_MOVE then
System.DebugLog "Moved"
elseif BitwiseAnd(Effect, dropsource.DROPEFFECT_LINK) = dropsource.DROPEFFECT_LINK then
System.DebugLog "Linked"
else
System.DebugLog "Unknown effect."
end if
elseif result = dropsource.DRAGDROP_S_CANCEL then
System.DebugLog "Cancel"
else
System.DebugLog "Other result."
end if
end if
End EventHandler
EventHandler Sub Paint(g As Graphics)
drawicons g, &cFFFFFF
End EventHandler
End Control
EventHandler Sub Open()
// We make our window a drop target to have the drag image visible within our application
w = new FileDropTarget
dim e as integer = w.AttachToWindow(Self)
System.DebugLog "AttachToWindow: "+str(e)
End EventHandler
Sub drawicons(g as Graphics, bgcolor as color)
g.ForeColor = bgcolor
g.FillRect 0,0,g.Width,g.Height
dim u as integer = UBound(app.files)
for i as integer = 0 to u
dim x as integer = i mod 2
dim y as integer = i \ 2
dim icon as Picture = app.files(i).IconMBS(32)
g.DrawPicture icon, x*50+50, y*50+50
next
End Sub
Property DragStarted As Boolean
Property dropsource As FileDragSource
Property w As FileDropTarget
End Class
Class FileDragSource Inherits WindowsDragSourceMBS
EventHandler Function GiveFeedback(Effect as integer) As integer
Return DRAGDROP_S_USEDEFAULTCURSORS
End EventHandler
EventHandler Function QueryContinueDrag(EscapePressed as boolean, KeyState as integer) As integer
System.DebugLog CurrentMethodName+" EscapePressed: "+str(EscapePressed)+" KeyState: "+str(KeyState)
if EscapePressed then
Return DRAGDROP_S_CANCEL
end if
if Bitwise.BitAnd(KeyState, MK_LBUTTON)=0 then
return DRAGDROP_S_DROP
end if
Return S_OK
End EventHandler
End Class
Class FileDropTarget Inherits WindowsDropTargetMBS
EventHandler Function DragEnter(dataObject as WinDataObjectMBS, keystate as integer, x as integer, y as integer, byref effect as integer) As integer
// deny drop
effect = DROPEFFECT_NONE
Return S_OK
End EventHandler
EventHandler Function DragLeave() As integer
return S_OK
End EventHandler
EventHandler Function DragOver(keystate as integer, x as integer, y as integer, byref effect as integer) As integer
// deny drop
effect = DROPEFFECT_NONE
Return S_OK
End EventHandler
EventHandler Function Drop(dataObject as WinDataObjectMBS, keystate as integer, x as integer, y as integer, byref effect as integer) As integer
// deny drop
effect = DROPEFFECT_NONE
Return S_OK
End EventHandler
End Class
End Project
See also:
- /Win/Drag and Drop/Attachment Drop from Outlook
- /Win/Drag and Drop/File Drag
- /Win/Drag and Drop/File Drop
- /Win/Drag and Drop/Folder Drag
- /Win/Drag and Drop/Picture Drag
- /Win/Drag and Drop/Picture Drag with Mask
- /Win/Drag and Drop/Picture Drop
- /Win/Drag and Drop/Picture Drop on control
- /Win/Drag and Drop/Text Drag
- /Win/Drag and Drop/Text Drop
The items on this page are in the following plugins: MBS Win Plugin.
