![]() ![]() Free verifies that the TMetafile reference is not nil before it calls Destroy.ĭestroy releases the image, which frees the image and the handle when the reference count on the metafile image is zero. Instead, an application should call Free. Destroy ( ) #ĭestroys an instance of a metafile object.ĭo not call Destroy directly in an application. Set the Description string of a new metafile by calling the TMetafileCanvas CreateWithComment constructor (Delphi) or the TMetafileCanvas constructor that takes a comment (C++). To set the CreatedBy string of a new metafile, call the TMetafileCanvas CreateWithComment constructor (Delphi) or the TMetafileCanvas constructor that takes a comment (C++). Use CreatedBy to set the string to an optional name of the author or application used to create the metafile. After the image is drawn on the canvas and the canvas is destroyed, the image is ‘playable’ in the metafile object. When the metafile canvas is destroyed, it transfers the image into the metafile object provided to the metafile canvas constructor. To create a metafile image from scratch, draw the image in a metafile canvas. Then sets the Enhanced and Transparent properties to true. Create ( ) #Ĭall Create to instantiate a metafile at runtime.Ĭreate allocates memory for a metafile object, and calls the inherited Create. Use Clear to release the old metafile image, create a new image, and increment a reference count on it. ![]() The method uses current stream position, it does not change current stream position. All content below this line refers to .ĬanLoadFromStream returns True when a specified stream contains a streamed image of a specific TGraphic subclass. CanLoadFromStream ( Stream : Stream ) → Boolean # For assignment, metafiles are polymorphic with other TGraphic objects, and with TPicture. ![]() ![]() Otherwise, Assign calls the inherited method. If the metafile is nil (Delphi) or NULL (C++), Assign creates one. Indicates whether the image covers its rectangular area.ĭetermines the maximum width of the graphics object in pixels.Īssign copies the Enhanced and Palette properties of an object to the metafile. Indicate whether graphic supports partial transparency or an alpha channel. Returns the reference to the scaled drawer. Indicates whether the palette has changed. Indicates the color palette of the graphical image. Indicates whether the graphics object has been changed or edited. Returns the units per inch that are used for the metafile's coordinate mapping.Ĭontains the height of the metafile image in 0.01 millimeter units, the native scale used by enhanced metafiles.Ĭontains the width of the metafile image in 0.01 millimeter units, the native scale used by enhanced metafiles. Specifies the vertical size of the graphic in pixels. Provides access to the Windows GDI metafile handle, for accessing the GDI metafile object. Indicates whether the graphics object contains a graphic.ĭetermines how the metafile will be stored on disk. Provides an optional text description that is embedded in the metafile. But still gdRowSelected is never in the state.Specifies the name of the author or application used to create the metafile. With dgRowSelect enabled, gdSelected is in the state for each cell in the entire row. I tried enabling the option dgRowSelect and it does make a change, but it's still only monitoring the gdSelected enum and never gdRowSelected. Evaluating gdSelected works fine, but not gdRowSelectedĭrawText(C.Handle, PChar(), Length(), procedure TForm1.gItemsDrawColumnCell(Sender: TObject const Rect: TRect ĭataCol: Integer Column: TColumn State: TGridDrawState) When a row is selected, it should show the text in that row in the color red. Why doesn't gdRowSelected ever apply? Is this a bug, or intentional functionality? But when I monitor gdRowSelected, it's never there, and thus I can't tell when a row is selected. When I read the event handler's State, I successfully capture gdSelected and color the font in the selected cell. I'm custom drawing in a DBGrid by monitoring OnDrawColumnCell to color the column. ![]()
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