Frame

Color picker example using the frame widget.

The frame widget is based on the container. It behaves like a window similar to the ones you know from your computer. It has a border, a window title and an optional button to close it.

Window title

The frames window title can either be set using the wi.g.text parameter of the initialization struct or the gwinSetText() API call.

Buttons

The frame widget can optionally implement a close button. It shows up as an 'x' in the top right hand corner. If the button is pressed, gwinDestroy() is automatically called on the frame widget. Therefore, the entire widget including all its children will be destroyed.

The close button can be enabled by passing GWIN_FRAME_CLOSE_BTN as a flag to the gwinFrameCreate() routine.

Overlay

If you want to use the frame widget as some kind of message box, then you have to note the following: The window manager of uGFX does currently not handle transparent inputs. This means that widgets that are "below" the frame are still being triggered when the area "above" them is being touched. To workaround this issue, a root container can be created that fills the entire screen size. Every widget and container will be added as a child to this root container. Hide the root container before the frame widgets shows up using gwinHide() and make it visible again using gwinShow() once the frame has been closed.

API reference

The API reference for the basic container can be found here.

Example

The following example shows how to create and use the frame widget. Several other widgets are added to the frame in order to create some kind of color picker dialog.

#include "gfx.h"
#include "stdio.h"
 
static GListener    gl;
static GHandle      ghFrame1;
static GHandle      ghSliderR, ghSliderG, ghSliderB;
static GHandle      ghButton1, ghButton2, ghButton3;
static GHandle      ghWindow1;
 
static void _updateColor(void) {
    uint32_t color;
 
    color  = (unsigned)gwinSliderGetPosition(ghSliderR) << 16;
    color |= (unsigned)gwinSliderGetPosition(ghSliderG) <<  8;
    color |= (unsigned)gwinSliderGetPosition(ghSliderB) <<  0;
 
    gwinSetBgColor(ghWindow1, HTML2COLOR(color));
    gwinClear(ghWindow1);
}
 
static void _createWidgets(void) {
    GWidgetInit wi;
 
    // Apply some default values for GWIN
    gwinWidgetClearInit(&wi);
    wi.g.show = TRUE;
 
    // Apply the frame parameters    
    wi.g.width = 300;
    wi.g.height = 200;
    wi.g.y = 10;
    wi.g.x = 10;
    wi.text = "Colorpicker";
    ghFrame1 = gwinFrameCreate(0, &wi, GWIN_FRAME_BORDER | GWIN_FRAME_CLOSE_BTN | GWIN_FRAME_MINMAX_BTN);
 
    // Apply the button parameters
    wi.g.width = 60;
    wi.g.height = 20;
    wi.g.x = 10;
    wi.g.y = 10;
    wi.text = "Random";
    wi.g.parent = ghFrame1;
    ghButton1 = gwinButtonCreate(0, &wi);
 
    // Apply the slider parameters
    wi.g.width = 200;
    wi.g.height = 20;
    wi.g.x = 80;
    wi.g.y += 0;
    wi.text = "Red";
    wi.g.parent = ghFrame1;
    ghSliderR = gwinSliderCreate(0, &wi);
    gwinSliderSetRange(ghSliderR, 0, 255);
    gwinSliderSetPosition(ghSliderR, 180);
 
    // Apply the button parameters
    wi.g.width = 60;
    wi.g.height = 20;
    wi.g.x = 10;
    wi.g.y += 25;
    wi.text = "Random";
    wi.g.parent = ghFrame1;
    ghButton2 = gwinButtonCreate(0, &wi);
 
    // Apply the slider parameters
    wi.g.width = 200;
    wi.g.height = 20;
    wi.g.x = 80;
    wi.g.y += 0;
    wi.text = "Green";
    wi.g.parent = ghFrame1;
    ghSliderG = gwinSliderCreate(0, &wi);
    gwinSliderSetRange(ghSliderG, 0, 255);
    gwinSliderSetPosition(ghSliderG, 60);
 
    // Apply the button parameters
    wi.g.width = 60;
    wi.g.height = 20;
    wi.g.x = 10;
    wi.g.y += 25;
    wi.text = "Random";
    wi.g.parent = ghFrame1;
    ghButton3 = gwinButtonCreate(0, &wi);
 
    // Apply the slider parameters
    wi.g.width = 200;
    wi.g.height = 20;
    wi.g.x = 80;
    wi.g.y += 0;
    wi.text = "Blue";
    wi.g.parent = ghFrame1;
    ghSliderB = gwinSliderCreate(0, &wi);
    gwinSliderSetRange(ghSliderB, 0, 255);
    gwinSliderSetPosition(ghSliderB, 235);
 
    // Color Preview
    wi.g.width = 270;
    wi.g.height = 65;
    wi.g.x = 10;
    wi.g.y = 90;
    ghWindow1 = gwinWindowCreate(0, &wi.g);
 
    _updateColor();
}
 
int main(void) {
    GEvent* pe;
 
    // Initialize the display
    gfxInit();
 
    // Attach the mouse input
    gwinAttachMouse(0);
 
    // Set the widget defaults
    gwinSetDefaultFont(gdispOpenFont("*"));
    gwinSetDefaultStyle(&WhiteWidgetStyle, FALSE);
    gdispClear(White);
 
    // 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_SLIDER:
                if (((GEventGWinSlider *)pe)->slider == ghSliderR || \
                                                        ghSliderG || \
                                                        ghSliderB ) {
                    _updateColor();
                }
                break;
 
            case GEVENT_GWIN_BUTTON:
                if (((GEventGWinButton *)pe)->button == ghButton1) {
                    gwinSliderSetPosition(ghSliderR, rand() % 256);
                } else if (((GEventGWinButton *)pe)->button == ghButton2) {
                    gwinSliderSetPosition(ghSliderG, rand() % 256);
                } else if (((GEventGWinButton *)pe)->button == ghButton3) {
                    gwinSliderSetPosition(ghSliderB, rand() % 256);
                }
 
                _updateColor();
 
            default:
                break;
        }
    }
 
    return 0;
}