Difference between revisions of "Frame"
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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. | 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. | ||
| − | [[File:Frame_example_1.PNG|right|frame]] | + | [[File:Frame_example_1.PNG|right|frame|captation]] |
== Window title == | == Window title == | ||
Revision as of 18:37, 1 July 2014
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; }
