Can PopupWindowAction be maximized after popup? I tried to override Invoke method but it doesn't work
protected override void Invoke(object parameter)
{
...
if (this.IsModal)
{
wrapperWindow.ShowDialog();
}
else
{
wrapperWindow.Show();
}
wrapperWindow.WindowState = WindowState.Maximized;
}
But it doesn't work
I used this class, and it worked fine for me:
public class MaximizedPopupWindowAction : PopupWindowAction
{
protected override Window GetWindow( INotification notification )
{
var window = base.GetWindow( notification );
window.SizeToContent = SizeToContent.Manual;
window.SourceInitialized += ( s, e ) => window.WindowState = WindowState.Maximized;
return window;
}
}
Related
Here is the code for the custom renderer i used to assign a custom icon as my back button.
namespace MyProjectName.Droid.Renderers
{
public class MyNavigationRenderer: PageRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Page> e)
{
base.OnElementChanged(e);
var context = (Activity)Xamarin.Forms.Forms.Context;
var toolbar = context.FindViewById<AndroidX.AppCompat.Widget.Toolbar>(Droid.Resource.Id.toolbar);
toolbar.NavigationIcon = AndroidX.Core.Content.ContextCompat.GetDrawable(context, Resource.Drawable.bbutton_nav);
}
}
}
This code successfully replaces the native back arrow icon with my custom bbutton_nav. When i navigate forward(Navigate.PushAsync()), the custom icon appears on all the upcoming screens. But when i click on the back icon to go back one page(Navigate.PopAsync()), the old native back arrow reappears instead of the new custom icon that was set by the renderer. When i tried debugging , i found out that the renderer class was not getting called when navigating back(Navigation.PopAsync()).
Any help on how to mitigate this issue is appreciated. Thanks
Create a custom renderer for NavigationPage instead of Page , and override the OnLayout method .
Android will change the detault icon back in UpdateToolbar method , and OnLayout method is triggered every time while current page is changed.
Android Solution
[assembly: ExportRenderer(typeof(NavigationPage), typeof(MyNavigationRenderer))]
namespace FormsApp.Droid
{
public class MyNavigationRenderer : NavigationPageRenderer
{
Context _context;
AndroidX.AppCompat.Widget.Toolbar _toolbar;
public MyNavigationRenderer(Context context) : base(context)
{
_context = context;
}
public override void OnViewAdded(Android.Views.View child)
{
base.OnViewAdded(child);
if (child.GetType() == typeof(AndroidX.AppCompat.Widget.Toolbar))
{
_toolbar = (AndroidX.AppCompat.Widget.Toolbar)child;
_toolbar.SetNavigationIcon(Resource.Drawable.bbutton_nav);
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
base.OnLayout(changed, l, t, r, b);
if (_toolbar != null)
{
if (_toolbar.NavigationIcon != null)
{
_toolbar.NavigationIcon = AndroidX.Core.Content.ContextCompat.GetDrawable(_context, Resource.Drawable.bbutton_nav);
}
}
}
}
}
Refer to https://forums.xamarin.com/discussion/183344/how-to-change-navigation-back-button-icon .
iOS Solution
[assembly: ExportRenderer(typeof(NavigationPage), typeof(MyRenderer))]
namespace FormsApp.iOS
{
class MyRenderer : NavigationRenderer
{
public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
if (this.NavigationBar.TopItem.BackBarButtonItem == null)
{
this.NavigationBar.BackIndicatorImage = UIImage.FromFile("dots.png");
this.NavigationBar.BackIndicatorTransitionMaskImage = UIImage.FromFile("dots.png");
this.NavigationBar.TopItem.BackBarButtonItem = new UIBarButtonItem("", UIBarButtonItemStyle.Plain, null);
}
}
}
}
I have tabbed page in Xamarin Forms (iOS side). I need custom renderer for tabbed page - make first tab not scrollable (it could be shown as button or label), rest of tabs should be scrollable.
I think creators of Xamarin Forms tabbed page implemented tabs like a horizontal listview. I just want to put a button as first element on the left and then put that listview with tabs. When button is clicked, the new view is being opened. How to do that?
I am using Naxam Library to provide top tabbed page - this is extension to tabbed page (at iOS it is at bottom). I have tried to use custom renderer, but no breakpoint is hitted. I don's know why.
using CoreAnimation;
using CoreGraphics;
using Foundation;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer(typeof(CustomTabbedPage), typeof(CustomTabbedPageRenderer))]
namespace Layout.xxx.iOS.CustomControlRenderers
{
public class CustomTabbedPageRenderer : Naxam.Controls.Platform.iOS.TopTabbedRenderer
{
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
DependencyService.Get<IAlertHandler>().ShowCustomAlertVoid("", "OnElementChanged");
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
AddButtonToTabbedPage();
DependencyService.Get<IAlertHandler>().ShowCustomAlertVoid("", "ViewDidLoad");
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
DependencyService.Get<IAlertHandler>().ShowCustomAlertVoid("", "Dispose");
}
public override void ViewDidAppear(bool animated)
{
base.ViewDidAppear(animated);
DependencyService.Get<IAlertHandler>().ShowCustomAlertVoid("", "ViewDidAppear");
}
public override void ViewDidDisappear(bool animated)
{
base.ViewDidDisappear(animated);
DependencyService.Get<IAlertHandler>().ShowCustomAlertVoid("", "ViewDidDisappear");
}
public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
DependencyService.Get<IAlertHandler>().ShowCustomAlertVoid("", "ViewDidLayoutSubviews");
}
public override void DidMoveToParentViewController(UIViewController parent)
{
base.DidMoveToParentViewController(parent);
DependencyService.Get<IAlertHandler>().ShowCustomAlertVoid("", "DidMoveToParentViewController");
}
private void AddButtonToTabbedPage()
{
var btn = new UIButton();
CAGradientLayer btnGradient = new CAGradientLayer();
btnGradient.Frame = btn.Bounds;
btnGradient.Colors = new CGColor[] { Color.Black.ToCGColor(), Color.White.ToCGColor() };
btnGradient.Locations = new NSNumber[] { 0.0f, 0.1f };
btn.Layer.AddSublayer(btnGradient);
btn.Layer.MasksToBounds = true;
btn.Layer.BorderColor = Color.Blue.ToCGColor();
btn.Layer.BorderWidth = 2;
btn.Layer.SetNeedsDisplay();
}
}
}
If you want to fix the first tab, you can use custom renderer to achieve it. Change the index<0 to index<1 to fix the first tab in the method GetPreviousViewController and GetNextViewController:
[assembly: ExportRenderer(typeof(myTopTabbedPage), typeof(myTopTabbedRenderer))]
namespace App12.iOS
{
class myTopTabbedRenderer : TopTabbedRenderer, IUIPageViewControllerDataSource
{
public override void ViewDidLoad()
{
base.ViewDidLoad();
}
public new UIViewController GetPreviousViewController(UIPageViewController pageViewController, UIViewController referenceViewController)
{
var index = ViewControllers.IndexOf(referenceViewController) - 1;
//in the source, it is if (index < 0) return null;
//change here to if (index < 1) will fix the first tab
if (index < 1) return null;
return ViewControllers[index];
}
public new UIViewController GetNextViewController(UIPageViewController pageViewController, UIViewController referenceViewController)
{
var index = ViewControllers.IndexOf(referenceViewController) + 1;
//in the source, it is if (index == ViewControllers.Count) return null;
//change here to if (index == ViewControllers.Count || index == 1) will fix the first tab
if (index == ViewControllers.Count || index == 1) return null;
return ViewControllers[index];
}
}
}
And in your xamarin.forms project, use myTopTabbedPage to create tabs:
public class myTopTabbedPage : TopTabbedPage {
}
var tabs = new myTopTabbedPage
{
Title = "TopTabs",
BarBackgroundColor = Color.FromHex("#9C27B0"),
SwipeEnabled = true,
BarIndicatorColor = Color.Green,
BarTextColor = Color.White
};
Try and let me know if it works for you.
Currently having an annoying issue of my UIButton not being Bound to the ViewModel. When clicking on the Button the ViewModel's IMVXCommand is not called. The button shows up but doesn't recognize the Touch Event. The Truly weird thing is if I was to create the LoginButton using the Interface Builder the below code works.
The following is sample code:
[Register("LoginView")]
public class LoginView : MvxView
{
UIBUtton loginButton;
public LoginView(IntPtr handler) : base(handler)
{
}
public LoginView(CGRect frame) : base(frame)
{
this.Frame = UIScreen.MainScreen.ApplicationFrame;
init();
}
init()
{
CreateView();
}
CreateView()
{
loginButton = new UIButton(new CoreGraphics.CGRect(0, 193, 300, 30))
{
Font = UIFont.SystemFontOfSize(15, UIFontWeight.Medium),
TranslatesAutoresizingMaskIntoConstraints = false,
BackgroundColor = UIColor.Red,
};
AddSubView(loginButton);
var set = this.CreateBindingSet<LoginView, LoginViewModel>();
set.Bind(loginButton).To(vm => vm.ClickCommand);
set.Apply();
}
}
ViewModel:
public class LoginViewModel : MvxViewModel
{
public AuthenticationViewModel() : base()
{
}
public IMvxCommand ClickCommand
{
get
{
return new MvxCommand(HandleClick);
}
}
public void HandleClick()
{
//This never gets called
}
}
WOW, so no joke 5 minutes after I posted this I realized I had forgotten to set the DataContext of the View to the ViewModel.
Literally, this line of code fixes the problem.
this.DataContext = new LoginViewModel();
Add that into the Init method and all is well
Hopefully, this helps someone else.
Its very common problem in iOS mobile development and that is while you are done with your UI and It contains too many UITextFields, If you try to input value in UITextFields those are added center bottom of the screen; these fields hides behind the keyboard. How can we get rid of this general problem?
You could use the AddObserver method in NSNotificationCenter for when keyboard is visible and hidden.
sample code(FYI: Got the code below from another post sometime last year, I can't remember link to the post but it works fine.)
Call the AddObserver in your viewdidload method
// Keyboard popup NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.DidShowNotification, KeyBoardUpNotification);
// Keyboard Down NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.WillHideNotification, KeyBoardDownNotification);
you can add the methods below in your base controller base if you have one
public void KeyBoardUpNotification(NSNotification notification) {
CGRect keyboardSize = UIKeyboard.BoundsFromNotification(notification);
// Find what opened the keyboard
foreach (UIView view in this.View.Subviews) {
if (view.IsFirstResponder)
activeview = view;
}
bottom = (activeview.Frame.Y + activeview.Frame.Height + offset);
scrollamount = (keyboardSize.Height - (View.Frame.Size.Height - bottom));
if (scrollamount > 0) {
moveViewUp = true;
MoveView(moveViewUp);
} else {
moveViewUp = false;
}
}
public void KeyBoardDownNotification(NSNotification notification) {
if (moveViewUp) {
MoveView(false);
}
}
private void MoveView(bool move) {
UIView.BeginAnimations(string.Empty, IntPtr.Zero);
UIView.SetAnimationDuration(0.3);
CGRect frame = View.Frame;
if (move) {
frame.Y -= scrollamount;
} else {
frame.Y += scrollamount;
scrollamount = 0;
}
View.Frame = frame;
UIView.CommitAnimations();
}
I have used a nuget package to get rid of this problem. I have overrides two methods and initialized code inside these methods.
Download KeyboardHandler and use as following:
using KeyboardHandler;
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
this.yourScrollView.SubscribeKeyboardManaqger();
}
public override void ViewWillDisappear(bool animated)
{
base.ViewWillDisappear(animated);
this.yourScrollView.UnsubscribeKeyboardManaqger();
}
I want extend an System.Windows.Forms.Panel(just inherit) and using a custom ControlDesigner.
I use a very minimalistic ControlDesigner implementation, just overwrite GetHitTest.
The problem is my custom panel instance is not ready to contains child controls any longer.
I play a little bit with AssociatedComponents but without effect. Remove custom designer attribute and it works great.
can someone help me to pin point whats wrong ???
[Designer(typeof(MyPanelDesigner)), ToolboxItem(true)]
public class MyPanel : System.Windows.Forms.Panel
{
// empty except for OnPaint
}
internal class DrawPanelDesigner : ControlDesigner
{
private MyPanel ParentControl
{
get
{
return Control as MyPanel;
}
}
public override System.Collections.ICollection AssociatedComponents
{
get
{
return ParentControl.Controls;
}
}
protected override bool GetHitTest(System.Drawing.Point point)
{
// hit detection for some owner drawed items in OnPaint
point = ParentControl.PointToClient(point);
var item = ParentControl.View.GetItemFromViewPoint(point.X, point.Y, true);
return null != item;
}
You are using the wrong designer. Try inheriting from the ScrollableControlDesigner instead:
internal class DrawPanelDesigner : ScrollableControlDesigner {
public DrawPanelDesigner() {
AutoResizeHandles = true;
}
private MyPanel ParentControl {
get {
return Control as MyPanel;
}
}
protected Pen BorderPen {
get {
Color penColor = Control.BackColor.GetBrightness() < .5 ?
ControlPaint.Light(Control.BackColor) :
ControlPaint.Dark(Control.BackColor);
Pen pen = new Pen(penColor);
pen.DashStyle = DashStyle.Dash;
return pen;
}
}
protected virtual void DrawBorder(Graphics graphics) {
Panel panel = (Panel)Component;
if (panel == null || !panel.Visible) {
return;
}
Pen pen = BorderPen;
Rectangle rc = Control.ClientRectangle;
rc.Width--;
rc.Height--;
graphics.DrawRectangle(pen, rc);
pen.Dispose();
}
protected override void OnPaintAdornments(PaintEventArgs pe) {
Panel panel = (Panel)Component;
if (panel.BorderStyle == BorderStyle.None) {
DrawBorder(pe.Graphics);
}
base.OnPaintAdornments(pe);
}
}