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using System;
using System.Diagnostics;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using Xamarin.UITest.Android;
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls
{
[Preserve (AllMembers = true)]
[Issue (IssueTracker.Bugzilla, 28570, "https://bugzilla.xamarin.com/show_bug.cgi?id=28570")]
internal class Bugzilla28570 : TestContentPage
{
public ScrollView ScrollView;
protected override void Init ()
{
Label header = new Label {
Text = "ScrollView Bug",
FontSize = 50,
FontAttributes = FontAttributes.Bold,
HorizontalOptions = LayoutOptions.Center
};
Label lab1 = new Label ();
lab1.Text = "Sometimes page content fits entirely on " +
"the page. That's very convenient. But " +
"on many occasions, the content of the page " +
"is much too large for the page, or only " +
"becomes available at runtime." +
"\n\n" +
"For cases such as these, the ScrollView " +
"provides a solution. Simply set its " +
"Content property to your content \u2014 in this " +
"case a Label but in the general case very " +
"likely a Layout derivative with multiple " +
"children \u2014 and the ScrollView provides " +
"scrolling with the distinctive look and touch " +
"familiar to the user." +
"\n\n" +
"The ScrollView is also capable of " +
"horizontal scrolling, and while that's " +
"usually not as common as vertical scrolling, " +
"sometimes it comes in handy." +
"\n\n" +
"Most often, the content of a ScrollView is " +
"a StackLayout. Whenever you're using a " +
"StackLayout with a number of items determined " +
"only at runtime, you should probably put it in " +
"a StackLayout just to be sure your stuff doesn't " +
"go running off the bottom of the screen." +
"Most often, the content of a ScrollView is " +
"a StackLayout. Whenever you're using a " +
"StackLayout with a number of items determined " +
"only at runtime, you should probably put it in " +
"a StackLayout just to be sure your stuff doesn't " +
"go running off the bottom of the screen.";
var targetLabel = new Label {Text = "Find Me"};
targetLabel.AutomationId = "28570Target";
lab1.FontSize = Device.GetNamedSize (NamedSize.Small, typeof (Label));
ScrollView = new ScrollView {
VerticalOptions = LayoutOptions.FillAndExpand,
Content = new StackLayout {
Children = {
lab1,
targetLabel
}
}
};
Button makeBig = new Button ();
makeBig.Text = "Tap";
//
// Clicking button first time does not scroll event though scrollView.Height is already set.
// Clicking a second time does correctly scroll to the end. scrollView.Height is unchanged.
//
// For this test to work you should make sure the text fits into the screen when the font is small
// and then becomes larger than the screeen when switching to the Large font.
//
makeBig.Clicked += (object sender, EventArgs e) => {
lab1.FontSize = Device.GetNamedSize (NamedSize.Large, typeof (Label));
Debug.WriteLine ("******** scrollView.Height= {0}", lab1.Height); // this shows the same updated size on all clicks, so this is not the problem.
ScrollView.ScrollToAsync (0, lab1.Bounds.Bottom, false);
};
// Build the page.
Content = new StackLayout {
Children = {
makeBig,
header,
ScrollView,
}
};
}
#if UITEST
[Test]
[Ignore("Fails intermittently on TestCloud")]
public void Bugzilla28570Test ()
{
if (RunningApp is AndroidApp) {
RunningApp.WaitForElement (q => q.Marked ("Tap"));
RunningApp.Screenshot ("At test page");
RunningApp.Tap (q => q.Marked ("Tap"));
RunningApp.WaitForElement (q => q.Marked ("28570Target"));
}
}
#endif
}
}
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