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DnDCacheData (Function) In french: DnDDonne Indicates the type of data and the data to copy/move during Drag/Drop. Remarks: - DnDCacheData must be used during the call to the dndBeginDrag event (DnDEvent).
- DnDCacheData can be used several times with different formats to copy different types of data from the source.
// Procedure called by the dndBeginDrag event
PROCEDURE BeginDrag()
// The value of the source control ("EDT_Edit") is copied/moved
// This data is a character string
DnDCacheData(CF_TEXT, EDT_Edit.Value)
// Procedure called in the code for Beginning of Drag/Drop
// to perform a Drag and Drop
// to the file explorer or to another application
PROCEDURE DNDToExplorer(sListFilePaths)
// Windows structure used to manage
// Drag/Drop with the explorer
POINT is Structure
x, y are int
END
DROPFILES is Structure
// Pointer to the list of files
pFiles is int
// Source position of mouse
PT is POINT
// Reserved
fNC is boolean
// True if the list of files is in UNICODE, False otherwise
fWide is boolean
END
// Fills a HDROP structure
stDROPFILES is DROPFILES
stDROPFILES:fWide = True // False for Ansi, otherwise Unicode,
stDROPFILES:fNC = True // Coordinates of PT in client area
stDROPFILES:PT:x = 0
stDROPFILES:PT:y = 0
stDROPFILES:pFiles = Dimension(stDROPFILES) // Size of structure
// sListFilePaths contains the list of files separated by CR characters
// for the multi-files, the CR character is replaced by a binary zero,
// and the 2 ending binary zeros are added
bufListOfFiles is Buffer
IF TypeVar(sListFilePaths) = wlUnicodeString THEN
bufListOfFiles = Replace(sListFilePaths, CR, ...
CharactUnicode(0)) + CharactUnicode(0) + CharactUnicode(0)
stDROPFILES:fWide = True // True for Unicode
ELSE
bufListOfFiles = Replace(sListFilePaths, CR, ...
Charact(0)) + Charact(0) + Charact(0)
stDROPFILES:fWide = False // False for Ansi, otherwise Unicode,
END
// Transfer the content of the structure into the buffer
// Calculate the necessary total size:
// size of structure and size of file names
// with the 2 ending Unicode binary zeros
nSize is int
nSize = Dimension(stDROPFILES) + Length(bufListOfFiles)
// Allocates a buffer for the DROP information
// to the requested size with binary zeros
bufDropData is Buffer
bufDropData = RepeatString(Charact(0), nSize)
// Includes the information of the stDROPFILES structure in the buffer
Transfer(&bufDropData, &stDROPFILES, Dimension(stDROPFILES))
// After the buffer, includes the names of files
Transfer(&bufDropData + Dimension(stDROPFILES), ...
&bufListOfFiles, Length(bufListOfFiles))
// Indicates that it is a file DROP
DnDCacheData(CF_HDROP, &bufDropData, nSize)
Syntax
Drag and Drop between WINDEV applications Hide the details
DnDCacheData(<Type of data> , <Data> [, <Size>])
<Type of data>: Integer or character string Type of data copied/moved.- Preset data types:
Only some types of data are presented below. See the Microsoft documentation ("Standard Clipboard Formats") for more details.
| | | | CF_TEXT | 1 | ANSI string ending with a \0 character | | CF_BITMAP | 2 | .BMP (bitmap image) | | CF_METAFILEPICT | 3 | .WMF (graphic primitive file) | | CF_SYLK | 4 | .SLK, Excel, Multiplan | | CF_DIF | 5 | Data interchange format (lotus) | | CF_TIFF | 6 | .TIF (TIFF image) | | CF_OEMTEXT | 7 | OEM string ending with a \0 character | | CF_DIB | 8 | .DIB (bitmap independent from the device managers) | | CF_PALETTE | 9 | Palette (Windows standard) | | CF_PENDATA | 10 | Optical pen | | CF_RIFF | 11 | Audio format | | CF_WAVE | 12 | .WAV (sound data) | | CF_UNICODETEXT | 13 | Text string with characters coded on 2 bytes (support for internationalization) | | CF_ENHMETAFILE | 14 | .EMF (Windows 32-bit graphic primitives ) | | CF_HDROP | 15 | Format of "dropped" file (in Windows NT) | | CF_LOCALE | 16 | Format local to Windows (in Windows NT) |
- Character string:
Type of data created beforehand.
For example:
Data1 is string = CUSTOMER.KEY + TAB + INVOICE.PRICE
DnDCacheData("MyType", Data1)
The "MyType" type will correspond to what was assigned to the "Data" string.
<Data>: Character string Data to retrieve. <Size>: Optional integer Number of bytes that will be assigned to <Data>.
Drag and Drop between a WINDEV application and a Windows application Hide the details
DnDCacheData(<Type of data> , <Pointer> [, <Size>])
<Type of data>: Integer or character string Type of data copied/moved.- Preset data types:
Only some types of data are presented below. See the Microsoft documentation ("Standard Clipboard Formats") for more details.
| | | | CF_TEXT | 1 | ANSI string ending with a \0 character | | CF_BITMAP | 2 | .BMP (bitmap image) | | CF_METAFILEPICT | 3 | .WMF (graphic primitive file) | | CF_SYLK | 4 | .SLK, Excel, Multiplan | | CF_DIF | 5 | Data interchange format (lotus) | | CF_TIFF | 6 | .TIF (TIFF image) | | CF_OEMTEXT | 7 | OEM string ending with a \0 character | | CF_DIB | 8 | .DIB (bitmap independent from the device managers) | | CF_PALETTE | 9 | Palette (Windows standard) | | CF_PENDATA | 10 | Optical pen | | CF_RIFF | 11 | Audio format | | CF_WAVE | 12 | .WAV (sound data) | | CF_UNICODETEXT | 13 | Text string with characters coded on 2 bytes (support for internationalization) | | CF_ENHMETAFILE | 14 | .EMF (Windows 32-bit graphic primitives ) | | CF_HDROP | 15 | Format of "dropped" file (in Windows NT) | | CF_LOCALE | 16 | Format local to Windows (in Windows NT) |
- Character string:
Type of data created beforehand.
For example:
Data1 is string = CUSTOMER.KEY + TAB + INVOICE.PRICE
DnDCacheData("MyType", Data1)
The "MyType" type will correspond to what was assigned to the "Data" string.
<Pointer>: Integer Pointer to a character string, a structure, ... <Size>: Optional integer Number of bytes that will be assigned to <Pointer>. Remarks The following variables can be used: | | | Variable name | Description |
|---|
| _DND.Action | Action specified in DnDAccept.
The possible values are: dndCopy, dndMove and dndNone.
This variable is not filled at the beginning of Drag and Drop in a source control (dndBeginDrag constant) or when exiting from a target control (dndDragLeave constant). | | _DND.TargetControl | Name of target control.
This variable is not filled at the beginning of Drag and Drop in a source control (dndBeginDrag constant) or when exiting from a target control (dndDragLeave constant). | | _DND.SourceControl | Name of source control. | | _DND.CtrlDown | Status of Ctrl key:- True: the Ctrl key is pressed.
- False: the Ctrl key is not pressed.
This variable is not filled at the beginning of Drag and Drop in a source control (dndBeginDrag constant) or when exiting from a target control (dndDragLeave constant). | | _DND.SourceWin | Name of source window.
This variable is not filled when exiting from a target control (dndDragLeave constant). | | _DND.MouseXPos | Horizontal position (X) of mouse cursor in relation to the control handled during the event.
This variable is not filled when exiting from a target control (dndDragLeave constant). | | _DND.MouseYPos | Vertical position (Y) of mouse cursor in relation to the control handled during the event.
This variable is not filled when exiting from a target control (dndDragLeave constant). |
The _DND.SourceControl and _DND.SourceWin variables return an empty string ("") when the Drag and Drop comes from an application other than the current application.
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