Texas Instruments TI89 Developer Guide - Page 58

16 4.2. Chapter 4: User Interface Overview Menus Menus allow the user to select an item from a hierarchical list of items. There are two formats: toolbars and pop-ups. Toolbars normally are placed at the top of the display and accessed with the function keys (even though they may be placed anywhere including within dialog boxes). Pop-ups "pop-up" over the display and are not attached to any toolbar. The MATH and CHAR keys bring up pop-ups as shown in Figures 4.1 and 4.2. Figure 4.1: MATH Menu Figure 4.2: CHAR Menu Menus can be defined with the resource compiler (static), MenuNew (dynamic) or both (the core menu is defined with the resource compiler which is then loaded into memory with the MenuLoad function so that it can be modified). The following example shows how a menu is defined by the resource compiler (see the MenuLoad function for an example using this menu as a core menu and then adding to it). This menu is shown in Figure 4.3. TOOLBAR AddToMenu, RC_NO_IDS, 0, 240 { "TOP 1", 10 { "SUB 1", 11 "SUB 2", 12 } "TOP 2", 20 { } } In the above example, the numbers 10, 11, 12, and 20 are menu IDs. A menu ID is an integer in the range from 1 to 4095 (0xFFF) which can be explicitly assigned by the creator of the menu or generated by the resource compiler. In the following example, MID_1, MID_2 and MID_CORRECT will have the values 1, 2, and 3 respectively, as generated by the resource compiler. This menu is shown in Figure 4.4. POPUP mPopupTest, 0, 0 { "POPUP 1", MID_1 "POPUP 2", MID_2 "SELECT THIS", MID_CORRECT } TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001