In Xamarin.Forms, when the phone is rotated I want to hide certain XAML components. I can't seem to find anything available from xamarin simple to use... can someone point me in the right direction?
thank you
Within a Xamarin.Forms Page, you could subscribe to the SizeChanged event or override the OnSizeAllocated method. There is some good documentation that describes both options. Below is an example of using OnSizeAllocated:
private double width = 0;
private double height = 0;
protected override void OnSizeAllocated(double width, double height)
{
base.OnSizeAllocated(width, height); //must be called
if (this.width != width || this.height != height)
{
this.width = width;
this.height = height;
if (this.width > this.height)
{
// reconfigure for landscape
}
else
{
// reconfigure for portrait
}
}
}
Related
How can I center the keyboard on the bottom of the screen?
I just have the sizes of the keyboard/PopupWindow after the board is already shown. Before calling show() every function returns 0.0 for the asked width. I could set the position correctly if I just knew the width before.
The keyboard size might change later, that's why I can't do it with a set size.
I am using the fx-onscreen-keyboard
My little service:
public class KeyboardService {
private double screenWidth = Screen.getPrimary().getVisualBounds().getWidth();
private double screenHight = Screen.getPrimary().getVisualBounds().getHeight();
private double keyboardPosX = 0.0;
private double keyboardPosY = 0.0;
private KeyBoardPopup keyboardPopup;
public KeyboardService() {
keyboardPopup = KeyBoardPopupBuilder.create().initLocale(Locale.GERMAN).build();
keyboardPopup.setAutoHide(true);
keyboardPopup.setConsumeAutoHidingEvents(false);
keyboardPopup.getKeyBoard().setScale(2.5);
keyboardPopup.getKeyBoard().setLayer(DefaultLayer.DEFAULT);
keyboardPopup.getKeyBoard().setOnKeyboardCloseButton((e) -> {
keyboardPopup.hide();
});
}
public void showKeyboard(Node node){
keyboardPosX = (screenWidth - keyboardPopup.getWidth())/2;
//keyboardPosX = (screenWidth - keyboardPopup.getKeyBoard().getWidth())/2;
keyboardPosY = screenHight;
keyboardPopup.show(node, keyboardPosX, keyboardPosY);
}}
The width of the keyboard is defined when the popup that holds it is laid out, what happens right after you call show.
The easy way to do this is by listening to the widthProperty of the KeyBoardPopup, to get the new value, and then moving the window of the popup accordingly.
This will do:
public KeyboardService() {
keyboardPopup = KeyBoardPopupBuilder.create().initLocale(Locale.GERMAN).build();
keyboardPopup.setAutoHide(true);
keyboardPopup.setConsumeAutoHidingEvents(false);
keyboardPopup.getKeyBoard().setScale(2.5);
keyboardPopup.getKeyBoard().setLayer(DefaultLayer.DEFAULT);
keyboardPopup.getKeyBoard().setOnKeyboardCloseButton((e) -> {
keyboardPopup.hide();
});
// listen to width changes and center
keyboardPopup.widthProperty().addListener((obs, ov, nv) -> {
keyboardPosX = (screenWidth - nv.doubleValue()) / 2d;
keyboardPopup.getScene().getWindow().setX(keyboardPosX);
});
}
public void showKeyboard(Node node) {
keyboardPosX = (screenWidth - keyboardPopup.getWidth())/2;
keyboardPosY = screenHeight;
keyboardPopup.show(node, keyboardPosX, keyboardPosY);
}
I have a Universal Xamarin Forms App with a single page wrapped in a NavigationPage:
Current.MainPage = new NavigationPage(new RootPage()
{
BackgroundColor = (Color)Application.Current.Resources["BackgroundColour"]
})
{
BackgroundColor = (Color)Application.Current.Resources["BackgroundColour"],
BarBackgroundColor = (Color)Application.Current.Resources["BackgroundColour"],
Padding = NavigationPaddingForPlatfrom()
};
I've also overridden GetSupportedInterfaceOrientations in AppDelegate and set a break point - however the break point is never hit. When I rotate in the simulator or device, the break point isn't hit. I've also set the Device Orientation in info.plist to Portrait only, however the App still rotates.
Am I missing some configuration point that's needed to control orientation?
I'm using Xamarin Forms 2.4.0.38779.
The end goal is to force a MasterDetail Page into landscape only.
For forcing exact mode this code worked for me:
public MainPage()
{
InitializeComponent();
OnOrientationChanged += OnOrientationChange;
OnOrientationChange(this, new OrientationChangedEventArgs(DeviceOrientation.Landscape));
}
private void OnOrientationChange(object sender, OrientationChangedEventArgs e)
{
IOrientationService orientationService = DependencyService.Get<IOrientationService>();
DeviceOrientation currentOrientation = orientationService.GetCurrentOrientation();
if (currentOrientation != DeviceOrientation.Landscape)
{
orientationService.SetCurrentOrientation(DeviceOrientation.Landscape);
}
}
Have you tried this.
protected override void OnSizeAllocated(double width, double height)
{
base.OnSizeAllocated(width, height);
if (width != this.width || height != this.height)
{
this.width = width;
this.height = height;
if (Width > Height)
{
//your grid
}
else
{
//your grid
}
}
}
After reading a lot of article and forum posts, I came across this:
https://forums.xamarin.com/discussion/79389/how-to-lock-orientation-in-landscape-for-an-ipad-only-app
The last post by JoeRaco references this SO post:
Xcode 7 ERROR ITMS-90474: "Invalid Bundle", can't submit to Apple
Without 'Requires full screen' set to true, GetSupportedInterfaceOrientations was not being called in AppDelegate. Therefore adding the following to the info.plist solved my problem:
<key>UIRequiresFullScreen</key>
<true/>
I am an android developer now trying my hands on unity.I am trying to do a simple drag and drop on a Button with the below code ,but as i drag to the extreme ends the button becomes lost ,I need the drag to take place within the screen width and height and only when i drag on the button.Hence i am new to Unity i need your guidance.I got the below code from unity forum
public class UserInterface : MonoBehaviour {
public Rect playerPositionRect = new Rect(0, 151, 200, 50);
private Vector2 currentDrag = new Vector2();
void Start () {
}
void Update () {
}
void OnGUI(){
GUI.Box (playerPositionRect, "MyButton" );
Vector2 screenMousePosition = new Vector2(Input.mousePosition.x, Screen.height - Input.mousePosition.y);
if (currentDrag.sqrMagnitude != 0 || playerPositionRect.Contains(screenMousePosition)) {
if (Input.GetMouseButtonDown(0)) {
currentDrag = screenMousePosition;
} else if (Input.GetMouseButton(0)) {
playerPositionRect.x += (screenMousePosition.x - currentDrag.x);
playerPositionRect.y += (screenMousePosition.y - currentDrag.y);
currentDrag = screenMousePosition;
} else {
currentDrag.x = 0;
currentDrag.y = 0;
}
}
}
}
After moving the button you need to make sure its still within the screen. The screen edges is Screen.Width, Screen.Height, 0 and 0 and if its outside we just move it back in. When we are at the right and bottom of the screen we also need to adjust for the buttons height and width.
else if (Input.GetMouseButton(0)) {
playerPositionRect.x += (screenMousePosition.x - currentDrag.x);
playerPositionRect.y += (screenMousePosition.y - currentDrag.y);
playerPositionRect.x = Mathf.Clamp(playerPositionRect.x, 0, Screen.width - playerPositionRect.width);
playerPositionRect.y = Mathf.Clamp(playerPositionRect.y, 0, Screen.height - playerPositionRect.height);
currentDrag = screenMousePosition;
}
Clamp just cuts the value if its outside of the range so for example a x value of -5 would be 0 or a value of 10000000 would be Screen.width - playerPositionRect.width.
In an AS3 mobile App, I would like to have a menu of buttons or icons that slides up from the bottom. Using a SlideViewTransition, I can get part of what I want.
var transition:SlideViewTransition = new SlideViewTransition();
transition.direction = ViewTransitionDirection.UP;
transition.mode = SlideViewTransitionMode.COVER;
view.navigator.pushView(ShareView, null, null, transition);
This works, but it does not do two things that I need to do.
1) I want the new transition to only go up 1/2 of the screen so that the top part of the screen displays the view underneath.
2) I want the new view that covers to be partially transparent. By setting the alpha of the incoming view's contentGroup background alpha, the new view is transparent as it comes in. But, once it covers the view underneath the view becomes opaque.
this.contentGroup.setStyle('backgroundAlpha', 0.5);
Does anyone have any ideas of how I would have a view slide up 1/2 way and be transparent? I have no idea where to start, view skinning?, or subclass transition?, or use something in flash namespace instead of a spark view.
I decided it would be simplest to just use the lower level ActionScript and do the animation myself using methods that are normally applied to a Sprite, but in this case use a VGroup so that I could add spark elements to it. The following is the base class I wrote.
public class SlideUpDialog extends VGroup {
private var pctHeight:Number;
private var stopHeight:Number;
private var vertIncrement:Number;
public function SlideUpDialog(pctHeight:Number) {
super();
this.pctHeight = pctHeight;
if (stage) {
addedToStageHandler();
} else {
addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
}
}
private function addedToStageHandler(event:Event=null) : void {
removeEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
graphics.beginFill(0xEEEEEE, 0.8);
graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight * pctHeight);
graphics.endFill();
var bevel:BevelFilter = new BevelFilter(4, -45);
this.filters = [ bevel ];
x = 0;
y = stage.stageHeight;
stopHeight = y * (1 - pctHeight);
vertIncrement = y / 2 / 24 / 4;
}
public function open() : void {
addEventListener(Event.ENTER_FRAME, openFrameHandler);
}
private function openFrameHandler(event:Event) : void {
if (y > stopHeight) {
y -= vertIncrement;
} else {
removeEventListener(Event.ENTER_FRAME, openFrameHandler);
}
}
public function close() : void {
... the reverse of open
}
}
I think there is a simple solution to this question, just not simple enough for me to find it.
Question:
How do you constrain a TitleWindow in Flex 3 from being dragged off the screen/stage? Is there a way to restrict the TitleWindow to the viewing area?
Example: Let's say I have an application that take 100% of the screen. Next, I create a TitleWindow via the PopUpManager. I can then proceed to click and hold (drag) that window off the screen, then release the mouse button. That window is now lost off-screen somewhere. Is there a way to keep the window from being dragged beyond the viewing area?
Thanks for the help in advance.
this is a very old post, but here's another way of doing it:
Whether you are extending the component or not, in the TitleWindow definition add the following line: move:"doMove(event)"
Import the Application library (import mx.core.Application;)
and add the doMove function:
private function doMove(event:Event):void
{//keeps TW inside layout
var appW:Number=Application.application.width;
var appH:Number=Application.application.height;
if(this.x+this.width>appW)
{
this.x=appW-this.width;
}
if(this.x<0)
{
this.x=0;
}
if(this.y+this.height>appH)
{
this.y=appH-this.height;
}
if(this.y<0)
{
this.y=0;
}
}
For flex 4 the answer is here: http://blog.flexexamples.com/2010/01/20/constraining-the-movement-on-a-spark-titlewindow-container-in-flex-4/
You can set its isPopUp property to false to prevent it from being dragged in the first place.
var popupWin:TitleWindow = PopUpManager.createPopUp(this, TitleWindow);
PopUpManager.centerPopUp(popupWin);
popupWin.isPopUp = false;
I don't know if the DragManager class in flex supports bounds checking, but if you really want to allow dragging but limit its bounds, you can still set isPopUp to false and implement the dragging code yourself so that the component never goes outside the limits specified by you. Check startDrag() method for an example. Bounds rectangle is the key.
Flex 4
<s:TitleWindow xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
windowMoving="windowMovingHandler(event)">
.
.
.
protected function windowMovingHandler(event:TitleWindowBoundsEvent):void
{
var appBounds:Rectangle = parentApplication.getBounds(DisplayObject(parentApplication));
if(!appBounds.containsRect(event.afterBounds)){
event.preventDefault();
}
}
// for better precision, corect appBounds manualy, or, instead of "parentApplication.getBounds..." create new rectangle of your application size
Subclass the TitleWindow and add a canvas over the title bar as a drag proxy. Then you can explicity call startDrag with a boundary rectangle.
This is pretty skeletal, but should put you on the path...
The reason for the proxy is you may get some weird behavior when you click the titleBar label if you don't have the canvas over it.
public class MyTitleWindow extends TitleWindow
{
public var titleBarOverlay:Canvas;
override protected function createChildren():void
{
super.createChildren();
if(!titleBarOverlay)
{
titleBarOverlay = new Canvas();
titleBarOverlay.width = this.width;
titleBarOverlay.height = this.titleBar.height;
titleBarOverlay.alpha = 0;
titleBarOverlay.setStyle("backgroundColor", 0x000000);
rawChildren.addChild(titleBarOverlay);
}
addListeners();
}
override protected function updateDisplayList(w:Number, h:Number):void
{
super.updateDisplayList(w, h);
titleBarOverlay.width = this.width;
titleBarOverlay.height = this.titleBar.height;
}
private function addListeners():void
{
titleBarOverlay.addEventListener(MouseEvent.MOUSE_DOWN, onTitleBarPress, false, 0, true);
titleBarOverlay.addEventListener(MouseEvent.MOUSE_UP, onTitleBarRelease, false, 0, true);
}
private function onTitleBarPress(event:MouseEvent):void
{
// Here you can set the boundary using owner, parent, parentApplication, etc.
this.startDrag(false, new Rectangle(0, 0, parent.width - this.width, parent.height - this.height));
}
private function onTitleBarRelease(event:Event):void
{
this.stopDrag();
}
}
You could simply override the move function and prevent "illegal" movement (it is called internally by the Panel drag management).
I think that you also should listen on stage resize, because reducing it (e.g. if the user resize the browser window) could send your popup out of stage even without actually moving it.
public class MyTitleWindow extends TitleWindow {
public function MyTitleWindow() {
// use a weak listener, or remember to remove it
stage.addEventListener(Event.RESIZE, onStageResize,
false, EventPriority.DEFAULT, true);
}
private function onStageResize(event:Event):void {
restoreOutOfStage();
}
override public function move(x:Number, y:Number):void {
super.move(x, y);
restoreOutOfStage();
}
private function restoreOutOfStage():void {
// avoid the popup from being positioned completely out of stage
// (use the actual width/height of the popup instead of 50 if you
// want to keep your *entire* popup on stage)
var topContainer:DisplayObjectContainer =
Application.application.parentDocument;
var minX:int = 50 - width;
var maxX:int = topContainer.width - 50;
var minY:int = 0;
var maxY:int = topContainer.height - 50;
if (x > maxX)
x = maxX
else if (x < minX)
x = minX;
if (y > maxY)
y = maxY
else if (y < minY)
y = minY;
}
}
In your TitleWindow's creationComplete handler add the following:
this.moveArea.visible=false;
This will do the job.
On the other hand, if you have a custom skin, you can remove the "moveArea" part. This should work, too.