THE WINDOW SERVER in .NET

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THE WINDOW SERVER
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Visible area This is an area that WSERV calculates for each window. It is the area of the window that is not obscured by any other window. Invalid area This is the area of a window that is waiting for a redraw. Areas may need redrawing after any of the following:
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They become visible when another window is destroyed or made invisible Their window is made visible Their window is positioned so it is partly outside the screen and then moved back onto the screen Part of their window loses its shadow Their window becomes unfaded The client calls Invalidate() on the window. Only instantiations of RWindow can have invalid areas, since WSERV knows how to draw other window types (see latter section on drawing of windows). The invalid area must be contained in the visible area. When a window has invalid areas, then WSERV will send it a redraw event. The client can discover the invalid area using the GetInvalidRegion() function.
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Drawing area This is the area that WSERV clips drawing to. It is calculated differently, depending on whether the window is being redrawn or not. If it s not being redrawn, then the drawing area is just the visible area less the invalid area. If the window is being redrawn, then the drawing area is the area being redrawn (that is, the area validated by the redraw) less any area that has become invalid since the redraw started. Shadow area This is the area of the window that is currently in shadow. When WSERV draws to a window, it actually does the drawing twice. First it draws to the part of the drawing region that is not in shadow, and then it draws to the part that is in shadow. The shadow ag is set for the second drawing.
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Drawing to windows
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In this section, I will discuss the different ways to draw to a window and the mechanisms in WSERV to support them.
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11.10.1 Drawing of blank windows
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WSERV handles the drawing of all blank windows (RBlankWindow) for the client. The client can specify a color for WSERV using the function SetColor(TRgb aColor). When drawing the window, WSERV must take account of the fact that this window could be faded (by calling the RWindowTreeNode::SetFaded() or RWindowBase::FadeBehind() functions) and that the window could have shadows cast on it. This means that when drawing a blank window, WSERV can use any of four different colors.
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11.10.2 Drawing of backup content windows
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A client requiring this kind of window must instantiate the class RBackupWindow. These windows could also be called bitmap backup windows, because WSERV keeps the content of the window in a bitmap, so that when the window would otherwise become invalid, WSERV can draw it from the bitmap without needing any co-operation from the owner. WSERV creates a bitmap that is the same size and color depth as the window, and uses this bitmap to mirror the content of the window. Because of the existence of the bitmap, the client must specify the window s color depth when it creates the window. If the client subsequently wants to change the window s size, then the operation may fail if there is not enough memory to change the size of the bitmap. There are two ways in which the bitmap can be used. When the window is created, the bitmap will store all the parts of the window that are not fully represented on the screen. Situations in which the window s content is not fully represented on the screen include: Parts of the window are behind other windows or outside the screen s area Parts of the window that have shadow cast upon them The window is faded There is not enough memory to calculate the area that is fully represented. However, if the window owner calls the function MaintainBackup() on its window object, then all of the content will also be stored in the bitmap as it changes. The disadvantage of doing this is that most pixels of the window will be drawn twice, to the screen and to the bitmap. There are two ways in which the two drawings can differ slightly. Firstly, if you are using the DrawBitmap() function, which scales things depending on the twips size of the relevant objects, then the scaling onscreen and in the backup bitmap can be different. This is because
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