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Thursday, November 13, 2003 |
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Panel Launching Behavior
Here's an underdocumented area of Palm OS:
Applications can launch pref panels using code like this:
LaunchWithCommand(sysFileTPanel, sysFileCFormats,
sysAppLaunchCmdPanelCalledFromApp, 0);
The "LaunchWithCommand" macro encapsulates a call to SysUIAppSwitch after finding the DB that matches the type/creator code passed to it. The key part here is the sysAppLaunchCmdPanelCalledFromApp launch code, which tells the panel that it should put up a "Done" button to exit the panel, rather than show a pop-up trigger with all the panel names.
The OS has a special hook in place to handle these panel launches. When the panel exits, the original app is restarted with a sysAppLaunchCmdReturnFromPanel launch code. If the application doesn't handle this launch code, the OS will again startup the app, this time using a sysAppLaunchNormal code.
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