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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/LegacyTechnologies/index.html">Legacy Documents</a> > <a href="../../samplecode/LegacyTechnologies/idxGraphicsImaging-date.html">Graphics & Imaging</a> > <A HREF="javascript:location.replace('index.html');">MyDeviceLoop</A> >
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<div style="width:100%; position:fixed;"><div align="center" id="watermark" style="position: relative; margin-left:auto; margin-right:auto; z-index:20; width:500px;"><div class="legacybox"><h1>Legacy Document<span class=closebutton><a href="javascript:closeWatermark()"><img src="../../images/closebutton.png" width="14" height="14" border="0" alt="close button"></a></span></h1>
<p><strong>Important: </strong>This document is part of the Legacy section of the ADC Reference Library. This information should not be used for new development.</p>
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<pre class="sourcecodebox">/* File: MyDeviceLoop.c Contains: This snippet shows how to write a device loop that works under System 7 and pre-7.0 systems. As described on pages 21-23 and 21-24 of Inside Mac volume VI, a device loop procedure searches all active screen devices, calling a drawing procedure whenever it encounters a screen that intersects the drawing region. In this app the drawing region is the app's window bounds and the chosen drawing procedure simply displays the screen's colors for every device the window bounds intersect. Written by: EL Copyright: Copyright © 1992-1999 by Apple Computer, Inc., All Rights Reserved. You may incorporate this Apple sample source code into your program(s) without restriction. This Apple sample source code has been provided "AS IS" and the responsibility for its operation is yours. You are not permitted to redistribute this Apple sample source code as "Apple sample source code" after having made changes. If you're going to re-distribute the source, we require that you make it clear in the source that the code was descended from Apple sample source code, but that you've made changes. Change History (most recent first): 08/2000 JM Carbonized, non-Carbon code is commented out for demonstration purposes. 7/12/1999 KG Updated for Metrowerks Codewarror Pro 2.1 */#include "CarbonPrefix.h"#include <Dialogs.h>#include <Fonts.h>/* Constant Declarations */#define WWIDTH 400#define WHEIGHT 256//#define WLEFT (((qd.screenBits.bounds.right - qd.screenBits.bounds.left) - WWIDTH) / 2)//#define WTOP (((qd.screenBits.bounds.bottom - qd.screenBits.bounds.top) - WHEIGHT) / 2)enum PointSelector {topLeft, botRight};/* Global Variable Definitions */WindowPtr gWindow;void initMac();void createWindow();void doMyDeviceLoop();void doDraw();void doEventLoop();void main(void){ initMac(); createWindow(); doEventLoop();}void initMac(){ /*MaxApplZone(); InitGraf( &qd.thePort ); InitFonts(); InitWindows(); InitMenus(); TEInit(); InitDialogs( nil );*/ InitCursor(); FlushEvents( 0, everyEvent );}void createWindow(){ Rect rect; BitMap bitMap; int top, left; GetQDGlobalsScreenBits(&bitMap); top = (((bitMap.bounds.bottom - bitMap.bounds.top) - WHEIGHT) / 2); left = (((bitMap.bounds.right - bitMap.bounds.left) - WWIDTH) / 2); //SetRect( &rect, WLEFT, WTOP, WLEFT + WWIDTH, WTOP + WHEIGHT ); SetRect( &rect, left, top, left + WWIDTH, top + WHEIGHT ); gWindow = NewCWindow( 0L, &rect, "\pMyDeviceLoop", true, documentProc, (WindowPtr)-1L, true, 0L ); //SetPort( gWindow ); SetPortWindowPort( gWindow ); TextFont( kFontIDTimes ); TextSize( 48 ); TextMode( srcCopy );}// Old version of doMyDeviceLoop, new version capable of supporting multiple monitors/*void doMyDeviceLoop(){ int depth; Rect gDeviceRect; Rect intersectingRect; GDHandle gDevice; //Point point; Rect tempRect1; // Get the handle to the first device in the list. gDevice = GetDeviceList(); // Loop through all the devices in the list. while (gDevice != nil) { // Get the device's gdRect and convert it to local coordinates. gDeviceRect = (**gDevice).gdRect; depth = (**(**gDevice).gdPMap).pixelSize; GlobalToLocal( topLeft ); GlobalToLocal( (Point *)botRight ); // Check if the app's window rect intersects the device's, and if it // does, set the clip region's rect to the intersection, then DRAW! //if (SectRect( &gWindow->portRect, &gDeviceRect, &intersectingRect )) if (SectRect( GetPortBounds(GetWindowPort(gWindow), &tempRect1), &gDeviceRect, &intersectingRect )) { ClipRect( &intersectingRect ); doDraw( depth, &intersectingRect ); } // Get the next device in the list. gDevice = GetNextDevice( gDevice ); }}*/// New doMyDeviceLoop, now works with multiple monitorsvoid doMyDeviceLoop(){ int depth; Rect gDeviceRect; Rect intersectingRect; GDHandle gDevice; //WindowRecord *windowRec = (WindowRecord *)gWindow; WindowPtr windowRec = gWindow; Rect windowRect; //= (**windowRec->contRgn).rgnBBox; RgnHandle rgnHandle = NewRgn(); GetWindowRegion(windowRec, kWindowContentRgn, rgnHandle); GetRegionBounds(rgnHandle, &windowRect); // Get the handle to the first device in the list. gDevice = GetDeviceList(); // Loop through all the devices in the list. while (gDevice != nil) { // Get the device's gdRect */ gDeviceRect = (**gDevice).gdRect; depth = (**(**gDevice).gdPMap).pixelSize; // Check if the app's window rect intersects the device's, and if it // does, set the clip region's rect to the intersection, then DRAW! if (SectRect( &windowRect, &gDeviceRect, &intersectingRect )) { // The intersectingRect is in global coords. Convert to local GlobalToLocal((Point *)&intersectingRect.top); GlobalToLocal((Point *)&intersectingRect.bottom); ClipRect( &intersectingRect ); doDraw( depth, &intersectingRect ); } // Get the next device in the list. gDevice = GetNextDevice( gDevice ); } DisposeRgn(rgnHandle);}void doDraw( depth)int depth;{ int i; int totalColors; int penThickness; //RGBColor color; CTabHandle ctable; Str255 string = "\pDirect Colors"; Rect tempRect1; if (depth > 8) { BackColor( blackColor ); ForeColor( blueColor ); /* Draw text for direct colors mode. */ //EraseRect( &gWindow->portRect ); EraseRect( GetPortBounds(GetWindowPort(gWindow), &tempRect1)); //MoveTo( (gWindow->portRect.right - StringWidth( string )) / 2, 130 ); MoveTo((GetPortBounds(GetWindowPort(gWindow), &tempRect1)->right - StringWidth(string)) / 2, 130); DrawString( string ); } else { /* Get the colortable at this depth. */ ctable = GetCTable( depth ); /* Set the line thickness to a fraction of the window height. */ totalColors = (2 << depth) / 2; //penThickness = gWindow->portRect.bottom / totalColors; penThickness = GetPortBounds(GetWindowPort(gWindow), &tempRect1)->bottom / totalColors; PenSize( 1, penThickness ); /* Now draw the colors at this depth. */ for (i = 0; i < totalColors; i++) { RGBForeColor( &(**ctable).ctTable[i].rgb ); MoveTo( 0, i * penThickness ); //LineTo( gWindow->portRect.right, i * penThickness ); LineTo(GetPortBounds(GetWindowPort(gWindow), &tempRect1)->right, i * penThickness); } /* Release the colortable memory. */ DisposeCTable( ctable ); }}void doEventLoop(){ EventRecord event; WindowPtr window; short clickArea; Rect screenRect; for (;;) { if (WaitNextEvent( everyEvent, &event, 0, nil )) { if (event.what == mouseDown) { clickArea = FindWindow( event.where, &window ); if (clickArea == inDrag) { //screenRect = (**GetGrayRgn()).rgnBBox; GetRegionBounds(GetGrayRgn(), &screenRect); DragWindow( window, event.where, &screenRect ); } else if (clickArea == inContent) { if (window != FrontWindow()) SelectWindow( window ); } else if (clickArea == inGoAway) if (TrackGoAway( window, event.where )) return; } else if (event.what == updateEvt) { window = (WindowPtr)event.message; //SetPort( window ); SetPortWindowPort( window ); BeginUpdate( window ); doMyDeviceLoop(); EndUpdate( window ); } } }}</pre>
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