Difference between revisions of "Label"

Revision as of 23:07, 17 June 2015

A label is a simple rectangular widget which takes no input. The label will automatically redraw it the text changed. If the label is smaller than the text it displays, the text gets clipped. The text of the label can be set using the gwinSetText() routine.

Border

The default drawing routine of the labels allows to enable or disable a border. This can be done using gwinLabelSetBorder().

Auto scale

If you apply a size of 0 to the width or the height of the label, the corresponding dimension will be scaled automatically. This also happens when you change the text or the font of the label. However, if you're using a border, this will certainly change the look of your application.

Justification

The text of a label is currently always justified to the left side. We'll update dynamic justification soon.

Attribute

Often you want to display multiple text elements below each other where an element consists of a static text which will always be the same and some variable one. The static text is called the attribute and can be optionally set through gwinLabelSetAttribute() once you enabled this feature in your gfxconf.h. The function does also take a tab parameter which allows to align multiple labels vertically as the following example shows:

Current IP: 192.168.1.42
Netmask:    255.255.255.0
DHCP:       On

API reference

The API reference of the label widget can be found here.

Example

The following example shows how to create a label.

#include "gfx.h"
 
static GHandle ghLabel1;
 
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 label parameters	
	wi.g.y = 10;
	wi.g.x = 10;
	wi.g.width = 100;
	wi.g.height = 20;
	wi.text = "Label 1";
 
	// Create the actual label
	ghLabel1 = gwinLabelCreate(NULL, &wi);
}
 
int main(void) {
	// Initialize the display
	gfxInit();
 
	// Set the widget defaults
	gwinSetDefaultFont(gdispOpenFont("UI2"));
	gwinSetDefaultStyle(&WhiteWidgetStyle, FALSE);
	gdispClear(White);
 
	// create the widget
	createWidgets();
 
	while(1) {
		gwinSetText(ghLabel1, "This is some text", TRUE);
		gfxSleepMilliseconds(1000);
		gwinSetText(ghLabel1, "Aaaand some other text", TRUE);
		gfxSleepMilliseconds(1000);
	}
 
	return 0;
}