Difference between revisions of "Label"

Revision as of 21:55, 6 November 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.

API reference

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

Border

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

Auto scale

Applying a size of 0 to the width or the height of the label will automatically set the corresponding dimension to fit the entire label text. Updating the label text will update the label dimensions each time. Note: If the the board is enabled the auto-sizing feature of the label will certainly change the look of the application.

Justification

The text justification of the label text can be set during creation of the label through gwinLabelCreate() or dynamically using gwinLabelSetJustification().

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:

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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, justifyLeft);
}
 
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;
}