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Titanium.Platform.DisplayCaps
Extends Titanium.Proxy
The Display Caps object returned by the Titanium.Platform.displayCaps property.
On iPhone and iPod devices with retina display, the density property is high and the dpi
property is 320. For other iPhone and iPod devices, density is medium and dpi is 160.
On iPad devices with retina display, the density property is high and the dpi
property is 260. For other iPad devices, density is medium and dpi is 130.
Note that Xcode versions prior to 4.3.1 do not have the correct tools to detect the iPad 3 retina display. Apps must be built with Xcode 4.3.1 or later to detect iPad 3 retina display.
Note that the displayCaps property begins with a lowercase letter, which differentiates it
from the DisplayCaps object that it returns. Refer to the example to understand how it should
be called.
On Android you have to make sure that the Activity is created before you fetch the displayCaps
values. Use the window onOpen event or win.activity.onCreate = () => {};.
Examples
System Display Information
Output the display properties to the system log.
Ti.API.info('Ti.Platform.displayCaps.density: ' + Ti.Platform.displayCaps.density);
Ti.API.info('Ti.Platform.displayCaps.dpi: ' + Ti.Platform.displayCaps.dpi);
Ti.API.info('Ti.Platform.displayCaps.platformHeight: ' + Ti.Platform.displayCaps.platformHeight);
Ti.API.info('Ti.Platform.displayCaps.platformWidth: ' + Ti.Platform.displayCaps.platformWidth);
if((Ti.Platform.osname === 'iphone')||(Ti.Platform.osname === 'ipad')||(Ti.Platform.osname === 'android')){
Ti.API.info('Ti.Platform.displayCaps.logicalDensityFactor: ' + Ti.Platform.displayCaps.logicalDensityFactor);
}
if(Ti.Platform.osname === 'android'){
Ti.API.info('Ti.Platform.displayCaps.xdpi: ' + Ti.Platform.displayCaps.xdpi);
Ti.API.info('Ti.Platform.displayCaps.ydpi: ' + Ti.Platform.displayCaps.ydpi);
}Properties 10
Inherited from Titanium.Proxy
The name of the API that this proxy corresponds to.
Inherited from Titanium.Proxy
Indicates if the proxy will bubble an event to its parent.
Default: true
Logical density of the display.
Display density expressed as dots-per-inch.
Inherited from Titanium.Proxy
The Window or TabGroup whose Activity lifecycle should be triggered on the proxy.
Logical density of the display, as a scaling factor for the Density Independent Pixel (dip) unit.
One dip is one pixel on a 160dpi display, approximately, with a 240x320, 1.5"x2" display providing a baseline. For example, for a 160dpi display, this value will be 1, and for 120dpi, it will be .75.
This value does not precisely follow the real display size, as given by xdpi and ydpi,
but instead is used to scale the size of the overall UI in steps based on changes in the
display dpi. For example, a 240x320 screen will have a density of 1, whether its width is
1.8" or 1.3". However, if the resolution is increased to 320x480 but the display remains
1.5"x2" then the density would be increased to about 1.5.
On iOS devices, this property returns 1, 2 and 3 for @1x, @2x and @3x respectively. Note for iPhone 6+, this value is 3.
Absolute height of the display in relation to UI orientation. Measured in platform-specific units; pixels on Android and density-independent pixels (dip) on iOS.
This property depends on the orientation of the UI, rather than the physical orientation of the device. While these may often be one in the same, it is not necessarily the case when orientation is restricted by Titanium.UI.Window.orientationModes. See example for clarification.
Platform Width and Height
Create a window and limit it to portrait mode. Start the app and observe that the platform width and height is output to the log. Change the physical orientation of the device and click the window to test again. Note that the logged information relates to the UI rather than the physical orientation of the device.
var win = Ti.UI.createWindow({
title: 'Click window to output UI dimensions',
backgroundColor: 'white',
orientationModes: [ Titanium.UI.PORTRAIT ], // UI restricted to portrait mode
fullscreen: false,
exitOnClose: true
});
var label = Ti.UI.createLabel({
text:'Hello world'
});
win.add(label);
function logDisplayCaps(){
Ti.API.info('Width x Height: ' + Ti.Platform.displayCaps.platformWidth + ' x ' + Ti.Platform.displayCaps.platformHeight);
}
win.addEventListener('click',function(e){
// as the UI orientation is restricted by orientationModes, this will only ever
// output the dimensions of the UI in portrait mode. For example, 480 x 800 for the
// Android device tested
logDisplayCaps();
});
win.open();
logDisplayCaps();Absolute width of the display in relation to UI orientation. Measured in platform-specific units; pixels on Android and density-independent pixels (dip) on iOS.
This property depends on the orientation of the UI, rather than the physical orientation of the device. While these may often be one in the same, it is not necessarily the case when orientation is restricted by Titanium.UI.Window.orientationModes. See example for clarification.
Platform Width and Height
Create a window and limit it to portrait mode. Start the app and observe that the platform width and height is output to the log. Change the physical orientation of the device and click the window to test again. Note that the logged information relates to the UI rather than the physical orientation of the device.
var win = Ti.UI.createWindow({
title: 'Click window to output UI dimensions',
backgroundColor: 'white',
orientationModes: [ Titanium.UI.PORTRAIT ], // UI restricted to portrait mode
fullscreen: false,
exitOnClose: true
});
var label = Ti.UI.createLabel({
text:'Hello world'
});
win.add(label);
function logDisplayCaps(){
Ti.API.info('Width x Height: ' + Ti.Platform.displayCaps.platformWidth + ' x ' + Ti.Platform.displayCaps.platformHeight);
}
win.addEventListener('click',function(e){
// as the UI orientation is restricted by orientationModes, this will only ever
// output the dimensions of the UI in portrait mode. For example, 480 x 800 for the
// Android device tested
logDisplayCaps();
});
win.open();
logDisplayCaps();Physical pixels per inch of the display in the X dimension.
Physical pixels per inch of the display in the Y dimension.
Methods 4
Inherited from Titanium.Proxy
Adds the specified callback as an event listener for the named event.
| Parameters | Type | Description |
|---|---|---|
| name | String | Name of the event. |
| callback | Callback<Titanium.Event> | Callback function to invoke when the event is fired. 4 fields
|
applyProperties
since 3.0.0Inherited from Titanium.Proxy
Applies the properties to the proxy.
| Parameters | Type | Description |
|---|---|---|
| props | Dictionary | A dictionary of properties to apply. |
Inherited from Titanium.Proxy
Fires a synthesized event to any registered listeners.
| Parameters | Type | Description |
|---|---|---|
| name | String | Name of the event. |
| event? | Dictionary | A dictionary of keys and values to add to the Titanium.Event object sent to the listeners. |
Inherited from Titanium.Proxy
Removes the specified callback as an event listener for the named event.
| Parameters | Type | Description |
|---|---|---|
| name | String | Name of the event. |
| callback | Callback<Titanium.Event> | Callback function to remove. Must be the same function passed to 4 fields
|