I am trying to change the height of a progress bar by using a custom renderer like here
The problem is, when the screen is rotated, the progress bar goes back to normal. Can someone help me?
I am using the same solution:
public override void LayoutSubviews()
{
base.LayoutSubviews();
var X = 1.0f;
var Y = 10.0f;
CGAffineTransform transform = CGAffineTransform.MakeScale(X, Y);
this.Control.Transform = transform;
}
I thnk you need to call the command SetNeedsLayout as discussed here . Of course you can also disable orientation change.
public override void OnConfigurationChanged (Android.Content.Res.Configuration newConfig)
{
base.OnConfigurationChanged (newConfig);
SetNeedsLayout ();
}
Related
I have used Animation() method to make my view with the animation of scaling and Rotation. With the Rotation based on the Y axis, the default height and width of my view has been changed. It looks like the parallelogram.
rotation of rectangle along y-axis transformed to a parallelogram.
myview.Animate().RotationY(rotationangle)
.X(xposition)
.SetDuration(mduration)
.WithLayer()
.SetInterpolator(interpolate).Start();
My requirement:
I just want the rotation of my view no need to change its projection. How to restrict the rotation of rectangle along y-axis transformed to a parallelogram.
For more reference, please check the attached sample
now view be like,
Image
Please share your idea.
Thanks in Advance.
Note: while using PivotX and PivotY, there is no parallelogram shape. But I don't know the exact usage of that.
Regards,
Hemalatha Marikumar
is that not what are you looking for ?
it may work if you put this code in your current activity
Android: Temporarily disable orientation changes in an Activity
Do you want to create a 2D rotation?
You could try to use ScaleAnimation to rotate the view. If you want to rotate 360 degrees, you could use AnimationListener.
For example:
Button myview = (Button)FindViewById(Resource.Id.button2);
ScaleAnimation scaleAnimation = new ScaleAnimation(1, 0, 1, 1,
Android.Views.Animations.Dimension.RelativeToParent, 0.5f, Android.Views.Animations.Dimension.RelativeToParent, 0.5f);
ScaleAnimation scaleAnimation2 = new ScaleAnimation(0, 1, 1, 1,
Android.Views.Animations.Dimension.RelativeToParent, 0.5f, Android.Views.Animations.Dimension.RelativeToParent, 0.5f);
scaleAnimation.Duration = 4000;
scaleAnimation.SetAnimationListener(new AnimationListener(myview, scaleAnimation2));
scaleAnimation2.Duration = 4000;
myview.StartAnimation(scaleAnimation);
The Listener:
public class AnimationListener :Java.Lang.Object, IAnimationListener
{
View view;
Animation animation2;
public AnimationListener(View view, Animation animation)
{
this.view = view;
this.animation2 = animation;
}
public void OnAnimationEnd(Animation animation)
{
view.StartAnimation(animation2);
}
public void OnAnimationRepeat(Animation animation)
{
}
public void OnAnimationStart(Animation animation)
{
}
}
I am creating one Xamarin Forms project and I got stuck in finding the current screen width according to the different device.
I know how it can be done in android and ios but need a way to find the width in portable.
You can try this Application.Current.MainPage.Width in my case this worked and i am able to find the device width in portable project itself.
I know it is an old thread but worth mentioning that recently Xamarin.Essentials NuGet pakage was released and there is a useful class DeviceDisplay in there that should handle this task for you.
The documentation can be found here.
Usage example:
// Get Metrics
var mainDisplayInfo = DeviceDisplay.MainDisplayInfo;
// Orientation (Landscape, Portrait, Square, Unknown)
var orientation = mainDisplayInfo.Orientation;
// Rotation (0, 90, 180, 270)
var rotation = mainDisplayInfo.Rotation;
// Width (in pixels)
var width = mainDisplayInfo.Width;
// Width (in xamarin.forms units)
var xamarinWidth = width / mainDisplayInfo.Density;
// Height (in pixels)
var height = mainDisplayInfo.Height;
// Screen density
var density = mainDisplayInfo.Density;
Common code (in App.xaml.cs)
public static int ScreenHeight {get; set;}
public static int ScreenWidth {get; set;}
Android part (in MainActivity.cs, in the OnCreate method)
App.ScreenHeight = (int) (Resources.DisplayMetrics.HeightPixels / Resources.DisplayMetrics.Density);
App.ScreenWidth = (int) (Resources.DisplayMetrics.WidthPixels / Resources.DisplayMetrics.Density);
iOS part (in AppDelegate.cs, in the FinishedLaunching method)
App.ScreenHeight = (int)UIScreen.MainScreen.Bounds.Height;
App.ScreenWidth = (int)UIScreen.MainScreen.Bounds.Width;
So App.ScreenHeight and App.ScreenWidth will be initialized when the App will be launched, then you will be able to use them anywhere in the common code.
You can use the Width property when you are in a ContentPage. For example,
protected override void OnAppearing()
{
base.OnAppearing();
double w = this.Width;
}
Note that this is set during the Layout phase. So, you can only use it after the page is initialized, otherwise it is -1.
https://developer.xamarin.com/api/property/Xamarin.Forms.VisualElement.Width/
I would like to create a static struct in the shared code, so I can access the screen width/height values easily (as well as doing bindings in xAML).
The struct in the app namespace (e.g. in App.xaml.cs):
using System;
using Xamarin.Forms;
namespace YourAppName {
...
public struct Constant {
public static double ScreenWidth = Application.Current.MainPage.Width;
public static double ScreenHeight = Application.Current.MainPage.Height;
}
}
Retrieving screen width in C#:
var labelWidth = Constant.ScreenHeight * 0.2;
// then do something with labelWidth
Retrieving screen width in XAML:
<Label Text="Text with insane font size" FontSize="{Binding Source={x:Static local:Constant.ScreenWidth}}"/>
Another approach would be to use the override "OnSizeAllocated" for your page and then take the height and width according to the changes on the user's screen. You can create a static class to set the height and width of your screen everytime it changes and then access them from this class when needed.
The static class to set and access the device dimension:
public static class ScreenDimensions
{
public static double Height { get; set; }
public static double Width { get; set; }
}
Override to obtain the screen dimensions:
protected override void OnSizeAllocated(double width, double height)
{
base.OnSizeAllocated(width, height);
ScreenDimensions.Height = height;
ScreenDimensions.Width = width;
}
I Guess that the best way is use the xamarin.forms.Device information.
Size size = Device.Info.PixelScreenSize;
if (size.Width <= 720 && size.Height <= 1280)
{
stkLayoutTop.Margin = new Thickness(5, 30, 10, 0);
}
else
{
stkLayoutTop.Margin = new Thickness(5, 50, 10, 0);
}
I have been developing a Xamarin forms application. I want to increase the height of the progress bar control. I used custom renders to change the color of the progress control. But I couldn't find any way to increase the height. Please help me. following is my Custom render class.
public class MyProgressBarRenderer:ProgressBarRenderer
{
protected override void OnElementChanged (
ElementChangedEventArgs<Xamarin.Forms.ProgressBar> e)
{
base.OnElementChanged (e);
Control.ProgressTintColor = Color.FromHex ("#254f5e").ToUIColor();
}
}
Add this override to MyProgressBarRenderer, and adjust Y as necessary....
using UIKit;
using CoreGraphics;
......
public override void LayoutSubviews()
{
base.LayoutSubviews();
var X = 1.0f;
var Y = 5.0f;
CGAffineTransform transform = CGAffineTransform.MakeScale(X,Y);
this.Transform = transform;
}
There is small issue in the iOS renderer code try using
this.Control.Transform = transform;
instead of
this.Transform = transform;
I am using the standard GUI of Unity3D.
How can I get the screen position of a GUI element?
Basically you can't. Using better words, as you already noticed GUI.Button simply returns a bool that indicated if the button has been pressed.
Since you are actually re-creating the button every frame (your GUI.Button code is inside a callback such as Update,FixedUpdate, OnGUI,...), and when you are calling GUI.Button you are passing it the Rect bounds by your self, there isn't actually any need of querying any object to retrieve the actual coordinates. Simply store them somewhere.
Rect buttonBounds = new Rect (50,60,100,20);
bool buttonPressed = GUI.Button (buttonBounds, "get postion");
if (buttonPressed)
{
//you know the bounds, because buttonBounds button has been pressed
}
Try this:
var positionGui : Vector2;
positionGui = Vector2 (guiElement.transform.position.x * Screen.width, guiElement.transform.position.y * Screen.height);
you can do something like this
public static Rect screenRect
(float tx,
float ty,
float tw,
float th)
{
float x1 = tx * Screen.width;
float y1 = ty * Screen.height;
float sw = tw * Screen.width;
float sh = th * Screen.height;
return new Rect(x1,y1,sw,sh);
}
public void OnGUI()
{
if (GUI.Button(screenRect(0.4f, 0.6f, 0.2f, 0.1f), "TRY AGAIN"))
{
Application.LoadLevel(0);
}
print ("button position + framesize"+screenRect(0.4f, 0.6f, 0.2f, 0.1f));
}
I'm trying to limit the height of a ListField, so that instead of moving down the screen when you move through the items, you only move down inside the box. So, for example, the header on the screen wouldn't disappear.
My current solution doesn't work. The height doesn't change. It stills stays at whatever size the list of objects is. The code I'm using is:
_listField = new ListField()
{
protected void layout(int w, int h)
{
super.layout(w, 100);
}
};
You can do this way. In your MainScreen constructor add
super(NO_VERTICAL_SCROLL);
so your mainscreen will not scroll.
create new manager which has vertical scrolling enabled so only manager will be scrollable like
VerticalFieldManager listManager = new VerticalFieldManager(VERTICAL_SCROLL | VERTICAL_SCROLLBAR);
Now add your components to this manager say your ListField like
listManager.add(your listfield object);
If you want to limit the height of listField, then you can set the limit to listManger and add the listfield to manager. so list will be layout in given height of manger like this
VerticalFieldManager listManager = new VerticalFieldManager(VERTICAL_SCROLL | VERTICAL_SCROLLBAR);
{
protected void sublayout( int maxWidth, int maxHeight )
{
int width = Display.getWidth();
int height = 100;
super.sublayout( width, height);
setExtent( width, height);
}
};
Hope this will help you.
Take a look at putting the list field inside a MainScreen. Then you can set the header as the title of the MainScreen.