I have the following simple example in WPF to play a video file using a VideoDrawing object - here is the code behind:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
MediaTimeline timeline = new MediaTimeline(new Uri(#"c:\test\RedRock-uhd-h264.mp4", UriKind.Absolute));
timeline.RepeatBehavior = RepeatBehavior.Forever;
MediaClock clock = timeline.CreateClock();
MediaPlayer player = new MediaPlayer();
player.Clock = clock;
VideoDrawing drawing = new VideoDrawing();
drawing.Rect = new Rect(0, 0, 820, 600); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 420, 280); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 220, 80); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 1, 1); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 0, 0); //<--video does not show
//drawing.Rect = new Rect(0, 0, 0, 0); //<--video does not show
drawing.Player = player;
DrawingBrush brush = new DrawingBrush(drawing);
this.Background = brush;
}
}
and here is the XAML:
<Window x:Class="MyMediaPlayer.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MediaPlayer in WPF" Width="620" Height="400"
WindowStyle="None"
ShowInTaskbar="True"
AllowsTransparency="True"
Background="Transparent"
WindowStartupLocation="Manual"
Left="0"
Top="0">
</Window>
look at the lines "drawing.Rect = new Rect(…) above and note the comments - no matter what size I set the Rect to - the video always plays at the size of the XAML MainWindow size (620, 400), however I have to set at least some Rect size I can't set it to 0 or comment it out. It seems like the video ought to play at the Rect size set, unless it is larger than the XAML MainWindow? What is it I don't understand about what I am doing and why doesn't the video play to the size of the Rect?
Set the stretch mode to None:
brush.Stretch = Stretch.None;
The problem with this of course is that you now don't have a way to set the color of the area around the player. If you want control of that then you'll have to switch to a VisualBrush and use a MediaElement instead:
// create a grid and bind it to the parent window's size
var grid = new Grid { Background = Brushes.CornflowerBlue }; // <- sets background color
grid.SetBinding(WidthProperty, new Binding
{
RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(Window), 1),
Path = new PropertyPath("ActualWidth"),
Mode = BindingMode.OneWay,
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
});
grid.SetBinding(HeightProperty, new Binding
{
RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(Window), 1),
Path = new PropertyPath("ActualHeight"),
Mode = BindingMode.OneWay,
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
});
// add the media player
grid.Children.Add(new MediaElement
{
Source = new Uri("yourvideo.mp4", UriKind.RelativeOrAbsolute),
LoadedBehavior = MediaState.Play,
Stretch = Stretch.Fill,
HorizontalAlignment = HorizontalAlignment.Center,
VerticalAlignment = VerticalAlignment.Center,
Width = 640, // <-- video size
Height = 480
});
// wrap it all up in a visual brush
this.Background = new VisualBrush { Visual = grid };
Related
I am currently using the package ZXing.Net.Mobile for Xamarin Forms.
I want content on the top of the screen and at the bottom of the screen and I want the scanner to be somewhere in the middle.
If I specify the height of the scanner, it stretches it making it ugly and not nice to have (because the scanner is meant to be used for full screen?).
I want to have some content on the top of the screen with a dynamic height, then I want the scanner with height 150-200, then I want some content to be shown on the rest of the screen.
I was looking into ZXingDefaultOverlay but I could not get it to work as I wanted.
Anyone has an idea, example or an answer that can help me?
Following is the sample code where I have used Grid
for showing content on top and bottom of the screen and middle screen contains scanner.
public ZXingDefaultOverlay()
{
BindingContext = this;
RowSpacing = 0;
VerticalOptions = LayoutOptions.FillAndExpand;
HorizontalOptions = LayoutOptions.FillAndExpand;
RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
RowDefinitions.Add(new RowDefinition { Height = new GridLength(2, GridUnitType.Star) });
RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
Children.Add(new BoxView
{
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.FillAndExpand,
BackgroundColor = Color.Transparent,
Opacity = 0.7,
}, 0, 0);
Children.Add(new BoxView
{
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.FillAndExpand,
BackgroundColor = Color.Transparent,
Opacity = 0.7,
}, 0, 2);
StackLayout ImageLabelContainer = new StackLayout();
Image imgBox = new Image();
imgBox.Source = "scan_qr.png";
imgBox.VerticalOptions = LayoutOptions.Fill;
imgBox.HorizontalOptions = LayoutOptions.FillAndExpand;
ImageLabelContainer.Children.Add(imgBox);
Label lblSuccess = new Label();
lblSuccess.Margin = new Thickness(0, 7, 0, 0);
lblSuccess.HorizontalTextAlignment = TextAlignment.Center;
lblSuccess.TextColor = Color.Green;
lblSuccess.AutomationId = "zxingDefaultOverlay_BottomTextLabel";
lblSuccess.SetBinding(Label.TextProperty, new Binding(nameof(BottomText)));
ImageLabelContainer.Children.Add(lblSuccess);
Children.Add(ImageLabelContainer, 0, 1);
}
Here you can set height of the rows as per your requirement.
I have something like this so far for my view:
public StackLayout OffersSlideViewCarouselChild(Offer offer)
{
Image productImage = new Image
{
Source = ImageSource.FromUri(new Uri(offer.Image.Replace("https://", "http://"))),
HeightRequest = 270,
WidthRequest = 270,
Aspect = Aspect.AspectFit
};
var topStackLayout = new StackLayout
{
Spacing = 0
};
topStackLayout.Children.Add(productImage);
StackLayout contentStackLayout = new StackLayout
{
Spacing = 0,
Padding = new Thickness(5, 10, 5, 10),
Orientation = StackOrientation.Vertical
};
var savedBtn = SavedButtonLayout(offer.IsSelected, offer.Id);
var redeemBtn = RedeemBtnLayout(offer.Id);
var timeRemainingLabel = TimeRemainingLayout(offer, offer.Id);
contentStackLayout.Children.Add(new UILabel(16) {
Text = offer.ProductName,
TextColor = ColorHelper.FromHex(CoreTheme.COLOR_OFFERCELL_PRODUCT_TEXT),
FontFamily = CoreTheme.FONT_FAMILY_DEFAULT_BOLD,
WidthRequest = DeviceDisplaySettings.defaultwidth,
VerticalTextAlignment = TextAlignment.Center
});
contentStackLayout.Children.Add(new UILabel(14)
{
Text = offer.Headline,
TextColor = ColorHelper.FromHex(CoreTheme.COLOR_OFFERCELL_PRODUCT_TEXT),
FontFamily = CoreTheme.FONT_FAMILY_DEFAULT_BOLD,
WidthRequest = DeviceDisplaySettings.defaultwidth,
VerticalTextAlignment = TextAlignment.Center
});
contentStackLayout.Children.Add(new UILabel(14) {
Text = offer.LongRewardsMessage,
TextColor = ColorHelper.FromHex(CoreTheme.COLOR_DEAL_PAGE_LONG_REWARD_MESSAGE_RED),
FontFamily = CoreTheme.FONT_FAMILY_DEFAULT_BOLD,
WidthRequest = DeviceDisplaySettings.defaultwidth,
VerticalTextAlignment = TextAlignment.Center
});
if (!string.IsNullOrEmpty(offer.PowerMessage)) {
var htmlText = string.Format("<html><body style='color:#9b9b9b'>{0}</body></html>", offer.PowerMessage.Replace(#"\", string.Empty));
var browser = new WebView() {
//HeightRequest = (DeviceDisplaySettings.defaultheight > 600) ? 500 : 400,
HeightRequest = 800,
Source = new HtmlWebViewSource() { Html = htmlText },
};
browser.Navigating += OnNavigating;
contentStackLayout.Children.Add(browser);
}
var nestedStackLayout = new StackLayout()
{
VerticalOptions = LayoutOptions.FillAndExpand
};
nestedStackLayout.Children.Add(topStackLayout);
nestedStackLayout.Children.Add(timeRemainingLabel);
nestedStackLayout.Children.Add(contentStackLayout);
var mainScrollView = new ScrollView()
{
Padding = new Thickness(0, 0, 0, 10),
VerticalOptions = LayoutOptions.FillAndExpand,
Orientation = ScrollOrientation.Vertical,
Content = nestedStackLayout
};
var mainStackLayout = new StackLayout()
{
Spacing = 5,
Padding = new Thickness(0, 0, 0, 0),
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.Fill,
Orientation = StackOrientation.Vertical,
Children = { savedBtn, mainScrollView, redeemBtn }
};
return mainStackLayout;
}
private StackLayout SavedButtonLayout(bool isSelected, int offerid)
{
int buttonsToShow = 2;
bool displaySaveButton = true;
if (IsPremisesOffer (offerid)) {
buttonsToShow = 3;
displaySaveButton = false;
}
btnShare = new UIFieldDefinition(_pageFieldDefinition.ShareButtonDefinition);
btnShare.Text = "SHARE";
btnShare.ClassId = offerid.ToString();
btnShare.WidthRequest = (DeviceDisplaySettings.defaultwidth / buttonsToShow) - 40;
btnShare.BackgroundColor = Color.FromRgb(167, 188, 33);
btnShare.VerticalContentAlignment = TextAlignment.Center;
btnShare.HandleClick(btnShare_Clicked);
btnSave = new UIFieldDefinition(_pageFieldDefinition.SaveButtonDefinition);
btnSave.Text = isSelected ? "UNSAVE" : "SAVE";
btnSave.ClassId = offerid.ToString();
btnSave.WidthRequest = (DeviceDisplaySettings.defaultwidth / buttonsToShow) - 40;
btnSave.BackgroundColor = Color.FromRgb(167, 188, 33);
btnSave.VerticalContentAlignment = TextAlignment.Center;
btnSave.HandleClick(btnSave_Clicked);
rl = new StackLayout {
Spacing = 10,
Orientation = StackOrientation.Horizontal,
BackgroundColor = Color.FromRgb(196, 221, 57),
Padding = new Thickness(40, 5, 5, 5),
WidthRequest = DeviceDisplaySettings.defaultwidth
};
rl.Children.Add(btnShare);
if (displaySaveButton) rl.Children.Add(btnSave);
return rl;
}
public UIFieldDefinition RedeemBtnLayout(int offerid)
{
int buttonsToShow = 1;
btnRedeem = new UIFieldDefinition(_pageFieldDefinition.RedeemButtonDefinition);
btnRedeem.Text = "REDEEM NOW";
btnRedeem.ClassId = offerid.ToString();
btnRedeem.WidthRequest = (DeviceDisplaySettings.defaultwidth / buttonsToShow) - 10;
// btnRedeem.HorizontalOptions = LayoutOptions.FillAndExpand;
// btnRedeem.VerticalOptions = LayoutOptions.EndAndExpand;
btnRedeem.HandleClick(btnRedeem_Clicked);
return btnRedeem;
}
However, I am noticing that the Redeem button does not even display on the view (It's supposed to be fixed on the bottom).
The scrollview works but the buttom is missing. Why?
Please let me know if you need further code details.
Moving here from comments above. There are two separate issues from what I can tell, and as far as I can tell, are unrelated:
The WebView, nested inside the ScrollView, is not big enough to fully display the content.
The button that is supposed to be at the bottom of the screen is not displaying.
For both of them, the answer is probably in how you are setting HeightRequest. There have been a lot of suggestions by myself and other commenters to change or get rid of some of the HeightRequest settings, and I'm not sure of the current state of your source code. So assuming those are still there:
For solving the WebView issue, read How can I add HTML to a Stacklayout inside a Scrollview in Xamarin forms?. This will let you figure out the right HeightRequest to use. The short answer is that depending on exactly what you want to happen, you may need a custom renderer. Note that the HeightRequest for the WebView will not affect any layout outside of the ScrollView.
For solving the issue of the button not appearing, get rid of the HeightRequest setting on the ScrollView, and the VerticalOptions on the StackLayout created in SavedButtonLayout.
I am assuming you did the experiment suggested above to make sure that the redeemBtn will render if placed before the ScrollView, and it does show up then. If not, you first need to fix that.
If you have "fixed" this by changing the HeightRequest then your real problem is the fixed pixel size of all your views and layouts, I recommend you DON'T use fixed pixel sizes for different screen resolution this will be a bigger problem later, What you can do is get the Screen size and do the math to fit all your elements of the view, one way to get the width and height of the screen is on the OnSizeChanged event of Pages (Like ContentPage), something like this:
SizeChanged += SizeChanged;
void SizeChanged (object sender, EventArgs e)
{
Layout.WidthRequest = Width * 0.3;
Layout.HeightRequest = Height * 0.35;
}
Your layout is pretty busy. A few things:
Set VerticalOptions to EndAndExpand for redeemBtn.
Set VerticalOptions to StartAndExpand for savedBtn.
Set VerticalOptions to Fill for mainScrollView.
Set VerticalOptions to FillAndExpand for mainRelLayout.
Set VerticalOptions and HorizontalOptions to Fill for
mainStackLayout.
I think that will get you to where you want to be.
The options that include "Expand" will grow the element to accommodate the desired height of its contents.
I am trying to understand why a ScaleTransform (testing under Windows Phone 8.0) is rendering using the control's parent dimensions, instead of the control itself. I have set up a demo app that shows this behaviour, as shown below.
The dimensions and hierarchy has a reason to be, that's why I manually set the Width and Height, as it's very close to the real app.
What I'd expect is that child1 (the yellow one), which is 768x1228 and has a scale of 0.625, would render itself as if it was 480x768, but what happens is that it renders like it was 300x480 (e.g., it is rendered at 0.625% of 480, instead of 768).
Any clues?
public partial class MainPage : PhoneApplicationPage
{
private Grid root;
public MainPage()
{
InitializeComponent();
root = new Grid() {
Width = 480,
Height = 768,
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Top,
Background = new SolidColorBrush(Colors.Blue)
};
Content = root;
Loaded += MainPage_Loaded;
}
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
var parent1 = new Grid {
Background = new SolidColorBrush(Colors.Red),
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Top,
Width = 480,
Height = 768
};
root.Children.Add(parent1);
var child1 = new Grid {
Background = new SolidColorBrush(Colors.Yellow),
Width = 768,
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Top,
Height = 1228,
RenderTransform = new ScaleTransform() {
CenterX = 0,
CenterY = 0,
ScaleX = 0.625,
ScaleY = 0.625
}
};
parent1.Children.Add(child1);
}
}
Well, looks like it's all due to the fact that the Grid component clip its child elements, as mentioned at http://wpf.2000things.com/tag/clipping. After I changed the code to have a Canvas aground my Grid, the app worked as expected.
I still find this "solution" strange, though.
I have the method, which is executed in Application_Deacitvated/Closing().
public bool createBackTile()
{
if(AlarmClock.IsExists())
{
ImageBrush background = new ImageBrush()
{
ImageSource = new BitmapImage(new Uri("/BackBackgroundTheme.png", UriKind.Relative)),
AlignmentX = AlignmentX.Center,
AlignmentY = AlignmentY.Center
};
// Preparing tile image.
TextBox tileImageData = new TextBox()
{
Text = AlarmClock.Read().ToShortTimeString(),
FontSize = 45,
FontWeight = FontWeights.Bold,
Foreground = new SolidColorBrush(Colors.White),
//Background = background,
Height = 173,
Width = 173,
HorizontalContentAlignment = HorizontalAlignment.Center,
VerticalContentAlignment = VerticalAlignment.Center,
Padding = new Thickness(-12),
Margin = new Thickness(0),
Clip = new RectangleGeometry { Rect = new Rect(0, 0, 173, 173) }
};
Canvas canvas = new Canvas()
{
Width = 173,
Height = 173,
Background = background,
Margin = new Thickness(0)
};
canvas.Children.Add(tileImageData);
// Saving tile image.
WriteableBitmap tileImage = new WriteableBitmap(173, 173);
tileImage.Render(canvas, null);
tileImage.Render(tileImageData, null);
tileImage.Invalidate();
using(var stream = IsolatedStorageFile.GetUserStoreForApplication().CreateFile("/Shared/ShellContent/BackBackground.jpg"))
{
tileImage.SaveJpeg(stream, 173, 173, 0, 100);
}
// Sets data for tile.
StandardTileData tileData = new StandardTileData()
{
BackgroundImage = new Uri("BackgroundAlarmSet.png", UriKind.Relative),
BackBackgroundImage = new Uri(#"isostore:/Shared/ShellContent/BackBackground.jpg"),
BackContent = "",
BackTitle = "",
};
// Sets tile.
ShellTile.ActiveTiles.FirstOrDefault().Update(tileData);
return true;
}
return false;
}
So, as you can see, I want to generate tile with my text in the center of it with image background "BackBackgroundTheme.png". That tile I'm trying to save in IsolatedStorage and assign it to BackBackgroundImage.
But it doesn't work. The tile is flipping over but the BackBackground is completly black. I have loaded this manipulated background and it seems that's indeed just black box. So, how to get it working?
Try: BackgroundImage = new Uri(#"isostore:/Shared/ShellContent/BackBackground.jpg", UriKind.Absolute)
I have finally found out where the problem is.
It seems, that generation of tile image isn't done properly in Application_Closing/Deactivating(). So I moved image generation to somwhere else and now, when application is closing/deactivating, I just set previously generated image to a tile.
Try this:
canvas.Children.Add(tileImageData);
canvas.UpdateLayout();
// Saving tile image.
WriteableBitmap tileImage = new WriteableBitmap(173, 173);
I'm trying to render some text and an image to a writeable bitmap to make 1 larger image, and this method has worked in other locations for creating or manipulating images, but for some reason, this instance is only creating a black image. If I just set the image source to the original WriteableBitmap, it shows just fine, but when I call SaveJpeg and then LoadJpeg, it shows as a black image (and yes, I need to call SaveJpeg since this is actually getting passed up to a server). The following is how I'm trying to render the elements:
NoteViewModel note = Instance.Note;
var grid = new Grid()
{
Height = 929,
Width = 929
};
grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(679) });
grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(1, GridUnitType.Star) });
var noteText = new TextBlock()
{
Text = note.Text,
FontFamily = note.FontFamily,
Foreground = note.FontColor,
TextWrapping = System.Windows.TextWrapping.Wrap,
Width = 929,
Height = 679
};
Grid.SetRow(noteText, 0);
grid.Children.Add(noteText);
WriteableBitmap sigImage = Instance.Signature.SignatureImage;
var sig = new Image()
{
Source = sigImage,
Height = 250,
Width = (sigImage.PixelWidth / sigImage.PixelHeight) * 250,
Margin = new Thickness(929 - ((sigImage.PixelWidth / sigImage.PixelHeight) * 250), 0, 0, 0)
};
Grid.SetRow(sig, 1);
grid.Children.Add(sig);
var messagePicture = new WriteableBitmap(grid, null);
var stream = new MemoryStream();
messagePicture.SaveJpeg(stream, messagePicture.PixelWidth, messagePicture.PixelHeight, 0, 100); //Save to a temp stream
stream.Position = 0;
var test = new WriteableBitmap(929,929); //Load the picture back up to see it
test.LoadJpeg(stream);
img.Source = test; //Show the image on screen (img is an Image element)
So apparently WriteableBitmap will render a transparent background as black when calling SaveJpeg, so I solved this by rendering a white canvas as well, like so:
var background = new Canvas()
{
Width = 929,
Height = 929,
Background = new SolidColorBrush(Colors.White)
};
messagePicture.Render(background, new TranslateTransform());