Difference between revisions of "CheckBox"
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Revision as of 18:42, 1 July 2014
A checkbox is a small stand-alone GUI element which only knows the two states checked and unchecked. The text attribute of a checkbox gets drawn by default on the left side of the checkbox. The checkbox itself is a quatratic construct with the side length given as the widget height. The width of the widget is supposed to be larger in order to contain the text.
API reference
The API reference of the checkbox widget can be found here.
Example
The following example shows how to use the checkbox widget:
#include "gfx.h" static GListener gl; static GHandle ghCheckbox1; static void createWidgets(void) { GWidgetInit wi; // Apply some default values for GWIN wi.customDraw = 0; wi.customParam = 0; wi.customStyle = 0; wi.g.show = TRUE; // Apply the checkbox parameters wi.g.width = 100; // includes text wi.g.height = 20; wi.g.y = 10; wi.g.x = 10; wi.text = "Checkbox"; // Create the actual checkbox ghCheckbox1 = gwinCheckboxCreate(NULL, &wi); } int main(void) { GEvent* pe; // Initialize the display gfxInit(); // Set the widget defaults gwinSetDefaultFont(gdispOpenFont("UI2")); gwinSetDefaultStyle(&WhiteWidgetStyle, FALSE); gdispClear(White); // Attach the mouse input gwinAttachMouse(0); // create the widget createWidgets(); // We want to listen for widget events geventListenerInit(&gl); gwinAttachListener(&gl); while(1) { // Get an Event pe = geventEventWait(&gl, TIME_INFINITE); switch(pe->type) { case GEVENT_GWIN_CHECKBOX: if (((GEventGWinCheckbox*)pe)->checkbox == ghCheckbox1) { // The state of our checkbox has changed printf("Checkbox state: %d\r\n", ((GEventGWinCheckbox*)pe)->isChecked); } break; default: break; } } return 0; }
