private void AssertButtonContentLayoutsEqual(Button.ButtonContentLayout layout1, object layout2)
{
var bcl = (Button.ButtonContentLayout)layout2;
Assert.AreEqual(layout1.Position, bcl.Position);
Assert.AreEqual(layout1.Spacing, bcl.Spacing);
}
void ComputeEdgeInsets(UIButton button, Button.ButtonContentLayout layout)
{
if (button?.ImageView?.Image == null || string.IsNullOrEmpty(button.TitleLabel?.Text))
{
return;
}
var position = layout.Position;
var spacing = (nfloat)(layout.Spacing / 2);
if (position == Button.ButtonContentLayout.ImagePosition.Left)
{
button.ImageEdgeInsets = new UIEdgeInsets(0, -spacing, 0, spacing);
button.TitleEdgeInsets = new UIEdgeInsets(0, spacing, 0, -spacing);
UpdateContentEdge(button, new UIEdgeInsets(0, 2 * spacing, 0, 2 * spacing));
return;
}
if (_titleChanged)
{
var stringToMeasure = new NSString(button.TitleLabel.Text);
UIStringAttributes attribs = new UIStringAttributes {
Font = button.TitleLabel.Font
};
var s = stringToMeasure.GetSizeUsingAttributes(attribs);;
_titleSize = new SizeF((float)s.Width, (float)s.Height);
_titleChanged = false;
}
var labelWidth = _titleSize.Width;
var imageWidth = button.ImageView.Image.Size.Width;
if (position == Button.ButtonContentLayout.ImagePosition.Right)
{
button.ImageEdgeInsets = new UIEdgeInsets(0, labelWidth + spacing, 0, -labelWidth - spacing);
button.TitleEdgeInsets = new UIEdgeInsets(0, -imageWidth - spacing, 0, imageWidth + spacing);
UpdateContentEdge(button, new UIEdgeInsets(0, 2 * spacing, 0, 2 * spacing));
return;
}
var imageVertOffset = (_titleSize.Height / 2);
var titleVertOffset = (button.ImageView.Image.Size.Height / 2);
var edgeOffset = (float)Math.Min(imageVertOffset, titleVertOffset);
UpdateContentEdge(button, new UIEdgeInsets(edgeOffset, 0, edgeOffset, 0));
var horizontalImageOffset = labelWidth / 2;
var horizontalTitleOffset = imageWidth / 2;
if (position == Button.ButtonContentLayout.ImagePosition.Bottom)
{
imageVertOffset = -imageVertOffset;
titleVertOffset = -titleVertOffset;
}
button.ImageEdgeInsets = new UIEdgeInsets(-imageVertOffset, horizontalImageOffset, imageVertOffset, -horizontalImageOffset);
button.TitleEdgeInsets = new UIEdgeInsets(titleVertOffset, -horizontalTitleOffset, -titleVertOffset, horizontalTitleOffset);
}
static Button CreateButton(Button.ButtonContentLayout layout)
{
return(new Button
{
Text = "Click Me",
ImageSource = "coffee.png",
ContentLayout = layout,
BackgroundColor = Color.Gray
});
}
static Button CreateButton(Button.ButtonContentLayout layout)
{
return(new Button
{
Text = "Click Me On Mac",
ImageSource = "bank.png",
Font = Font.OfSize("Helvetica", 14),
ContentLayout = layout,
BackgroundColor = Color.Black,
TextColor = Color.White
});
}
static Button CreateButton(Button.ButtonContentLayout layout)
{
return(new Button
{
Text = "Click Me On Mac",
ImageSource = "bank.png",
FontFamily = "Helvetica",
FontSize = 14,
ContentLayout = layout,
BackgroundColor = Colors.Black,
TextColor = Colors.White
});
}
static StackPanel CreateContentContainer(Button.ButtonContentLayout layout, WImage image, string text)
{
var container = new StackPanel();
var textBlock = new TextBlock
{
Text = text,
VerticalAlignment = VerticalAlignment.Center,
HorizontalAlignment = HorizontalAlignment.Center
};
var spacing = layout.Spacing;
container.HorizontalAlignment = HorizontalAlignment.Center;
container.VerticalAlignment = VerticalAlignment.Center;
switch (layout.Position)
{
case Button.ButtonContentLayout.ImagePosition.Top:
container.Orientation = Orientation.Vertical;
image.Margin = new WThickness(0, 0, 0, spacing);
container.Children.Add(image);
container.Children.Add(textBlock);
break;
case Button.ButtonContentLayout.ImagePosition.Bottom:
container.Orientation = Orientation.Vertical;
image.Margin = new WThickness(0, spacing, 0, 0);
container.Children.Add(textBlock);
container.Children.Add(image);
break;
case Button.ButtonContentLayout.ImagePosition.Right:
container.Orientation = Orientation.Horizontal;
image.Margin = new WThickness(spacing, 0, 0, 0);
container.Children.Add(textBlock);
container.Children.Add(image);
break;
default:
// Defaults to image on the left
container.Orientation = Orientation.Horizontal;
image.Margin = new WThickness(0, 0, spacing, 0);
container.Children.Add(image);
container.Children.Add(textBlock);
break;
}
return(container);
}
void UpdateBitmap()
{
if (Element == null || _isDisposed)
{
return;
}
FileImageSource elementImage = Button.Image;
string imageFile = elementImage?.File;
_imageHeight = -1;
if (elementImage == null || IsNullOrEmpty(imageFile))
{
SetCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
return;
}
Drawable image = Context.GetDrawable(imageFile);
if (IsNullOrEmpty(Button.Text))
{
// No text, so no need for relative position; just center the image
// There's no option for just plain-old centering, so we'll use Top
// (which handles the horizontal centering) and some tricksy padding (in OnLayout)
// to handle the vertical centering
// Clear any previous padding and set the image as top/center
UpdateContentEdge();
SetCompoundDrawablesWithIntrinsicBounds(null, image, null, null);
// Keep track of the image height so we can use it in OnLayout
_imageHeight = image.IntrinsicHeight;
image.Dispose();
return;
}
Button.ButtonContentLayout layout = Button.ContentLayout;
CompoundDrawablePadding = (int)layout.Spacing;
switch (layout.Position)
{
case Button.ButtonContentLayout.ImagePosition.Top:
SetCompoundDrawablesWithIntrinsicBounds(null, image, null, null);
break;
case Button.ButtonContentLayout.ImagePosition.Bottom:
SetCompoundDrawablesWithIntrinsicBounds(null, null, null, image);
break;
case Button.ButtonContentLayout.ImagePosition.Right:
SetCompoundDrawablesWithIntrinsicBounds(null, null, image, null);
break;
default:
// Defaults to image on the left
SetCompoundDrawablesWithIntrinsicBounds(image, null, null, null);
break;
}
image?.Dispose();
}
internal static bool IsHorizontal(this Button.ButtonContentLayout layout) => layout.Position == Button.ButtonContentLayout.ImagePosition.Left || layout.Position == Button.ButtonContentLayout.ImagePosition.Right;
public static Button ContentLayout(this Button button, Button.ButtonContentLayout layout)
{
button.ContentLayout = layout;
return(button);
}
