private List <Android.Views.View> GetAllChildrenBFS(Android.Views.View v)
{
List <Android.Views.View> visited = new List <Android.Views.View>();
List <Android.Views.View> unvisited = new List <Android.Views.View>();
unvisited.Add(v);
while (unvisited.Count > 0)
{
Android.Views.View child = unvisited[0];
unvisited.Remove(child);
visited.Add(child);
if (!(child is ViewGroup))
{
continue;
}
ViewGroup group = (ViewGroup)child;
int childCount = group.ChildCount;
for (int i = 0; i < childCount; i++)
{
unvisited.Add(group.GetChildAt(i));
}
}
return(visited);
}
protected override void OnElementChanged(ElementChangedEventArgs <TabbedPage> e)
{
base.OnElementChanged(e);
var activity = this.Context.GetActivity();
if (e.NewElement != null)
{
var tab = (TabLayout)ViewGroup.GetChildAt(1);
viewpaper = (ViewPager)ViewGroup.GetChildAt(0);
var container = (LinearLayout)activity.LayoutInflater.Inflate(Resource.Layout.Stepper, null);
container.SetBackgroundColor(Android.Graphics.Color.ParseColor("#ffae38"));
tabNew = container.FindViewById <Stepper.StepperIndicator>(Resource.Id.stepper);
var parameter = (LinearLayout.LayoutParams)tabNew.LayoutParameters;
parameter.SetMargins(DpToPixels(20), DpToPixels(30), DpToPixels(20), DpToPixels(30));
tabNew.LayoutParameters = parameter;
tabNew.SetViewPager(viewpaper);
layout = container;
AddView(layout);
}
if (e.NewElement != null)
{
}
}
private T FindChildOfType <T>(ViewGroup viewGroup) where T : Android.Views.View
{
if (viewGroup == null || viewGroup.ChildCount == 0)
{
return(null);
}
for (var i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
var typedChild = child as T;
if (typedChild != null)
{
return(typedChild);
}
if (!(child is ViewGroup))
{
continue;
}
var result = FindChildOfType <T>(child as ViewGroup);
if (result != null)
{
return(result);
}
}
return(null);
}
public static Tuple <View, PointF> GetTouchedView(this ViewGroup viewGroup, PointF point, PointF offset = null)
{
offset = offset ?? new PointF();
for (var n = 0; n < viewGroup.ChildCount; n++)
{
var view = viewGroup.GetChildAt(n);
if (view.IsHit(point))
{
var vg = view as ViewGroup;
if (vg != null)
{
offset = new PointF(offset.X + vg.Left, offset.Y + vg.Top);
var p = new PointF(point.X - vg.Left, point.Y - vg.Top);
return(GetTouchedView(vg, p, offset));
}
else if (string.IsNullOrWhiteSpace(view.ContentDescription))
{
return(new Tuple <View, PointF>(viewGroup, offset));
}
return(new Tuple <View, PointF>(view, offset));
}
}
return(null);
}
private NumberPicker FindMinuteNumberPicker(ViewGroup viewGroup)
{
for (var i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
var numberPicker = child as NumberPicker;
if (numberPicker != null)
{
if (numberPicker.MaxValue == 59)
{
return(numberPicker);
}
}
var childViewGroup = child as ViewGroup;
if (childViewGroup != null)
{
var childResult = FindMinuteNumberPicker(childViewGroup);
if (childResult != null)
{
return(childResult);
}
}
}
return(null);
}
private static void load_saved_scene(ViewGroup tableLayout, int aSide)
{
var saveGameArea = new SaveGameArea();
var getSavedData = saveGameArea.GetGame_Area_(aSide);
var gameButton = new GameButton();
for (var i = 0; i < aSide; i++)
{
for (var j = 0; j < aSide; j++)
{
var tableRow = (TableRow)tableLayout.GetChildAt(i);
var border = (FrameLayout)tableRow.GetChildAt(j);
var frameLayout = (FrameLayout)border.GetChildAt(0);
if (getSavedData != null)
{
if (getSavedData.Values[i, j] <= 0)
{
continue;
}
frameLayout.SetBackgroundColor(gameButton.get_color_from_number(getSavedData.Values[i, j]));
GameButton.set_btn_number(border, getSavedData.Values[i, j].ToString());
}
else
{
return;
}
}
}
}
public static IEnumerable <View> GetChildren(this ViewGroup view)
{
for (int i = 0; i < view.ChildCount; i++)
{
yield return(view.GetChildAt(i));
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (setup)
{
return;
}
if (e.PropertyName == "Renderer")
{
pager = (ViewPager)ViewGroup.GetChildAt(0);
layout = (TabLayout)ViewGroup.GetChildAt(1);
setup = true;
ColorStateList colors = null;
if ((int)Build.VERSION.SdkInt >= 23)
{
colors = Resources.GetColorStateList(Resource.Color.icon_tab, Forms.Context.Theme);
}
else
{
colors = Resources.GetColorStateList(Resource.Color.icon_tab);
}
for (int i = 0; i < layout.TabCount; i++)
{
var tab = layout.GetTabAt(i);
var icon = tab.Icon;
if (icon != null)
{
icon = Android.Support.V4.Graphics.Drawable.DrawableCompat.Wrap(icon);
Android.Support.V4.Graphics.Drawable.DrawableCompat.SetTintList(icon, colors);
}
}
}
}
/// <summary>
/// Displays all the visual descendants of <paramref name="viewGroup"/> for diagnostic purposes.
/// </summary>
public static string ShowDescendants(this ViewGroup viewGroup, StringBuilder sb = null, string spacing = "", ViewGroup viewOfInterest = null)
{
sb = sb ?? new StringBuilder();
AppendView(viewGroup);
spacing += " ";
for (int i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
if (child is ViewGroup childViewGroup)
{
ShowDescendants(childViewGroup, sb, spacing, viewOfInterest);
}
else
{
AppendView(child);
}
}
return(sb.ToString());
StringBuilder AppendView(View innerView)
{
var name = (innerView as IFrameworkElement)?.Name;
var namePart = string.IsNullOrEmpty(name) ? "" : $"-'{name}'";
return(sb
.Append(spacing)
.Append(innerView == viewOfInterest ? "*>" : ">")
.Append(innerView.ToString() + namePart)
.Append($"-({ViewHelper.PhysicalToLogicalPixels(innerView.Width)}x{ViewHelper.PhysicalToLogicalPixels(innerView.Height)})")
.Append($" {innerView.Visibility}")
.AppendLine());
}
}
protected override void OnElementChanged(ElementChangedEventArgs <TabbedPage> e)
{
base.OnElementChanged(e);
if (e.NewElement == null || e.OldElement != null)
{
return;
}
TabLayout tablayout = (TabLayout)ViewGroup.GetChildAt(1);
Android.Views.ViewGroup vgroup = (Android.Views.ViewGroup)tablayout.GetChildAt(0);
for (int i = 0; i < vgroup.ChildCount; i++)
{
Android.Views.ViewGroup vvgroup = (Android.Views.ViewGroup)vgroup.GetChildAt(i);
Typeface fontFace = Typeface.CreateFromAsset(this.Context.Assets, "IranSans.ttf");
for (int j = 0; j < vvgroup.ChildCount; j++)
{
Android.Views.View vView = (Android.Views.View)vvgroup.GetChildAt(j);
if (vView.GetType() == typeof(Android.Support.V7.Widget.AppCompatTextView) || vView.GetType() == typeof(Android.Widget.TextView))
{
//here change textview style
TextView txtView = (TextView)vView;
txtView.TextSize = 14f;
txtView.SetTypeface(fontFace, TypefaceStyle.Normal);
}
}
}
}
/**
* Android4.4以上的状态栏着色
*
* @param window 一般都是用于Activity的window,也可以是其他的例如Dialog,DialogFragment
* @param statusBarColor 状态栏颜色
* @param alpha 透明栏透明度[0.0-1.0]
*/
public static void TintStatusBar(Window window, int statusBarColor, float alpha)
{
if (Build.VERSION.SdkInt < BuildVersionCodes.Kitkat)
{
return;
}
if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
{
window.ClearFlags(WindowManagerFlags.TranslucentStatus);
window.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);// WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.SetStatusBarColor(Color.Transparent);
}
else
{
window.AddFlags(WindowManagerFlags.TranslucentStatus); // WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
ViewGroup decorView = (ViewGroup)window.DecorView; // GetDecorView();
ViewGroup contentView = (ViewGroup)window.DecorView.FindViewById(Window.IdAndroidContent); // GetDecorView().findViewById(Window.ID_ANDROID_CONTENT);
View rootView = contentView.GetChildAt(0);
if (rootView != null)
{
rootView.SetFitsSystemWindows(true);
//ViewCompat.SetFitsSystemWindows(rootView, true);
}
SetStatusBar(decorView, statusBarColor, true);
SetTranslucentView(decorView, alpha);
}
void DisableTaskInput(ViewGroup frame, bool enable)
{
if (frame as ListView != null || frame as ScrollView != null)
{
frame.Enabled = enable;
frame.Focusable = enable;
frame.FocusableInTouchMode = enable;
}
int i;
for (i = 0; i < frame.ChildCount; i++)
{
View child = frame.GetChildAt(i) as View;
if ((child as ViewGroup) != null)
{
DisableTaskInput((child as ViewGroup), enable);
}
else
{
if (child as ListView != null || child as ScrollView != null)
{
child.Enabled = enable;
child.Focusable = enable;
child.FocusableInTouchMode = enable;
}
}
}
}
private NumberPicker FindNumberPicker(ViewGroup control, int maxValue)
{
for (var i = 0; i < control.ChildCount; i++)
{
var child = control.GetChildAt(i);
var picker = child as NumberPicker;
if (picker != null)
{
if (picker.MaxValue == maxValue)
{
return(picker);
}
}
var childViewGroup = child as ViewGroup;
if (childViewGroup != null)
{
var childResult = FindNumberPicker(childViewGroup, maxValue);
if (childResult != null)
{
return(childResult);
}
}
}
return(null);
}
private static ViewGroup FindChildOfType <T>(ViewGroup parent)
{
if (parent.ChildCount == 0)
{
return(null);
}
for (var i = 0; i < parent.ChildCount; i++)
{
var child = parent.GetChildAt(i) as ViewGroup;
if (child == null)
{
continue;
}
if (child is T)
{
return(child);
}
var result = FindChildOfType <T>(child);
if (result != null)
{
return(result);
}
}
return(null);
}
/// <summary>
/// Returns the date picker view object so we can hide what we like for the relevant controls.
/// </summary>
/// <param name="group">The dialog to pass through.</param>
/// <returns></returns>
public static DatePicker FindDatePicker(ViewGroup group)
{
if (group != null)
{
for (int i = 0; i < group.ChildCount; i++)
{
View child = group.GetChildAt(i);
Console.WriteLine($"{child.GetType()} - {i}");
if (child is DatePicker)
{
return((DatePicker)child);
}
//recursion!
else if (child is ViewGroup)
{
Console.WriteLine("going deeper");
DatePicker result = FindDatePicker((ViewGroup)child);
if (result != null)
{
return(result);
}
}
}
}
return(null);
}
protected override void OnElementChanged(ElementChangedEventArgs <CarouselPage> e)
{
base.OnElementChanged(e);
_pagedCarouselPage = (CxPagedCarouselPage)Element;
_viewPager = null;
for (int i = 0; i < ViewGroup.ChildCount; i++)
{
_viewPager = ViewGroup.GetChildAt(i) as ViewPager;
if (_viewPager != null)
{
break;
}
}
if (_viewPager == null)
{
return;
}
var density = Resources.DisplayMetrics.Density;
_circlePageIndicator = new CirclePageIndicator(base.Context);
_circlePageIndicator.SetPadding(5, 5, 5, 5);
_circlePageIndicator.Radius = 5 * density;
SetPageIndicatorTintColor();
SetCurrentPageIndicatorTintColor();
AddView(_circlePageIndicator);
_circlePageIndicator.BringToFront();
}
void ClearChildren(ViewGroup group)
{
if (group == null)
{
return;
}
int count = group.ChildCount;
for (var i = 0; i < count; i++)
{
AView child = group.GetChildAt(i);
var g = child as ViewGroup;
if (g != null)
{
ClearChildren(g);
}
Type childType = child.GetType();
Stack <AView> stack;
if (!_freeViews.TryGetValue(childType, out stack))
{
_freeViews[childType] = stack = new Stack <AView>();
}
stack.Push(child);
}
group.RemoveAllViews();
}
private void NewElement_OnDrawBitmap(object sender, EventArgs e)
{
try
{
if (this.ViewGroup != null)
{
var element = sender as BarcodeView;
//get the subview
Android.Views.View subView = ViewGroup.GetChildAt(0);
int width = subView.Width;
int height = subView.Height;
//create and draw the bitmap
Bitmap b = Bitmap.CreateBitmap(width, height, Bitmap.Config.Argb8888);
Canvas c = new Canvas(b);
ViewGroup.Draw(c);
byte[] bitmapData = null;
using (var stream = new MemoryStream())
{
b.Compress(Bitmap.CompressFormat.Png, 0, stream);
bitmapData = stream.ToArray();
}
element.BarcodeUrl = Convert.ToBase64String(bitmapData);
}
}
catch (Exception ex)
{
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
_pager = (ViewPager)ViewGroup.GetChildAt(0);
_layout = (TabLayout)ViewGroup.GetChildAt(1);
var control = (CustomTabbedPage)sender;
Android.Graphics.Color selectedColor;
Android.Graphics.Color unselectedColor;
if (control != null)
{
selectedColor = control.SelectedIconColor.ToAndroid();
unselectedColor = control.UnselectedIconColor.ToAndroid();
}
else
{
selectedColor = new Android.Graphics.Color(ContextCompat.GetColor(Context, Resource.Color.tabBarSelected));
unselectedColor = new Android.Graphics.Color(ContextCompat.GetColor(Context, Resource.Color.tabBarUnselected));
}
for (int i = 0; i < _layout.TabCount; i++)
{
var tab = _layout.GetTabAt(i);
var icon = tab.Icon;
if (icon != null)
{
var color = tab.IsSelected ? selectedColor : unselectedColor;
icon = Android.Support.V4.Graphics.Drawable.DrawableCompat.Wrap(icon);
icon.SetColorFilter(color, PorterDuff.Mode.SrcIn);
}
}
}
static View GetFrontmostChildAt(ViewGroup viewGroup, int x, int y)
{
var locArray = new int[2];
for (int i = viewGroup.ChildCount - 1; i >= 0; i--)
{
var child = viewGroup.GetChildAt(i);
child.GetLocationOnScreen(locArray);
var frame = new AG.Rect(
locArray [0],
locArray [1],
locArray [0] + child.Width,
locArray [1] + child.Height);
if (!frame.Contains(x, y))
{
continue;
}
var childGroup = child as ViewGroup;
if (childGroup != null)
{
var grandChild = GetFrontmostChildAt(childGroup, x, y);
if (grandChild != null)
{
return(grandChild);
}
}
return(child);
}
return(null);
}
protected override void OnElementChanged(ElementChangedEventArgs <NavigationPage> e)
{
base.OnElementChanged(e);
if (e?.NewElement != null)
{
_navigationPage = Element as MaterialNavigationPage;
_toolbar = ViewGroup.GetChildAt(0) as Toolbar;
HandleParent(_navigationPage.Parent);
HandleChildPage(_navigationPage.CurrentPage);
}
if (e?.OldElement != null)
{
if (_childPage != null)
{
_childPage.PropertyChanged -= ChildPage_PropertyChanged;
}
if (_multiPageParent != null)
{
_multiPageParent.CurrentPageChanged -= MultiPageParent_CurrentPageChanged;
}
}
}
bool CanScrollUp(ViewGroup viewGroup)
{
if (viewGroup == null)
{
return(base.CanChildScrollUp());
}
var sdk = (int)global::Android.OS.Build.VERSION.SdkInt;
if (sdk >= 16)
{
#if __ANDROID_16__
//is a scroll container such as listview, scroll view, gridview
if (viewGroup.IsScrollContainer)
{
return(base.CanChildScrollUp());
}
#endif
}
//if you have something custom and you can't scroll up you might need to enable this
//for instance on a custom recycler view where the code above isn't working!
for (int i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
if (child is Android.Widget.AbsListView)
{
var list = child as Android.Widget.AbsListView;
if (list != null)
{
if (list.FirstVisiblePosition == 0)
{
var subChild = list.GetChildAt(0);
return(subChild != null && subChild.Top != 0);
}
//if children are in list and we are scrolled a bit... sure you can scroll up
return(true);
}
}
else if (child is Android.Widget.ScrollView)
{
var scrollview = child as Android.Widget.ScrollView;
return(scrollview.ScrollY <= 0.0);
}
else if (child is Android.Webkit.WebView)
{
var webView = child as Android.Webkit.WebView;
return(webView.ScrollY > 0.0);
}
else if (child is Android.Support.V4.Widget.SwipeRefreshLayout)
{
return(CanScrollUp(child as ViewGroup));
}
//else if something else like a recycler view?
}
return(false);
}
private void NewElement_OnDrawBitmap(object sender, EventArgs e)
{
var calendarView = sender as ActivityCalendarView;
if (this.ViewGroup is null || calendarView is null)
{
return;
}
// If we are not in readonly, we dont generate image.
if (calendarView.IsInputEnabled)
{
return;
}
//get the subview
global::Android.Views.View subView = ViewGroup.GetChildAt(0);
int width = ViewGroup.Width;
int height = ViewGroup.Height;
//create and draw the bitmap
Bitmap b = Bitmap.CreateBitmap(800, 800, Bitmap.Config.Argb8888);
Canvas c = new Canvas(b);
ViewGroup.Draw(c);
//save the bitmap to file
var bytes = SaveBitmapToBytes(b);
var base64 = Convert.ToBase64String(bytes);
calendarView.SetImage(bytes);
}
private void DeletePlace(object sender, EventArgs e)
{
ViewGroup parent = (ViewGroup)((ImageButton)sender).Parent;
for (int i = 0; i < parent.ChildCount; i++)
{
View child = parent.GetChildAt(i);
if (child.GetType() == typeof(AppCompatTextView))
{
chosenPlaces.RemoveAll(p => p.Name == ((TextView)child).Text);
break;
}
}
ViewGroup topParent = (ViewGroup)parent.Parent.Parent;
for (int i = 0; i < choicesRoot.ChildCount; i++)
{
View child = choicesRoot.GetChildAt(i);
if (child.Id == topParent.Id)
{
choicesRoot.RemoveViewAt(i);
break;
}
}
if (choicesRoot.ChildCount <= 1)
{
choicesRoot.Visibility = ViewStates.Gone;
}
}
public static T GetChild <T>(this ViewGroup viewGroup) where T : class
{
T child = null;
int numVisuals = viewGroup.ChildCount;
for (int i = 0; i < numVisuals; i++)
{
//var v = VisualTreeHelper.GetChild(viewGroup, i);
var v = viewGroup.GetChildAt(i);
child = v as T;
if (child != null)
{
return(child);
}
if (v is ViewGroup childViewGroup)
{
child = childViewGroup.GetChild <T>();
}
if (child != null)
{
return(child);
}
}
return(child);
}
public void GetAnswer(ViewGroup parent)
{
List <VoteData> votes = new List <VoteData>();
for (int i = 0; i < parent.ChildCount; i++)
{
View child = parent.GetChildAt(i);
if (child is RadioGroup)
{
var rdgrp = (RadioGroup)child;
if (rdgrp.CheckedRadioButtonId > -1)
{
votes.Add(new VoteData
{
StudentNumber = 201901001,
FirstName = "Jason",
MI = "T.",
LastName = "Dee",
GradeLevel = 7,
Section = "St Anthony",
CandidateStudentNumber = 201901001,
Position = "President",
});
}
}
}
// InsertVoteData(votes);
}
public static void SetFonts(this ViewGroup grp, Typeface type, ICollection <View> ignoreList = null)
{
for (var i = 0; i < grp.ChildCount; i++)
{
var view = grp.GetChildAt(i);
if (ignoreList != null &&
ignoreList.Select(_ => ReferenceEquals(view, _)).ToList().Count == 0)
{
continue;
}
var viewGroup = view as ViewGroup;
if (viewGroup != null)
{
SetFonts(viewGroup, type, ignoreList);
continue;
}
var textView = view as TextView;
if (textView == null)
{
continue;
}
if (ignoreList == null)
{
textView.SetTypeface(type, TypefaceStyle.Normal);
}
}
}
/// <summary>
/// Displays all the visual descendants of <paramref name="viewGroup"/> for diagnostic purposes.
/// </summary>
public static string ShowDescendants(this ViewGroup viewGroup, StringBuilder sb = null, string spacing = "", ViewGroup viewOfInterest = null)
{
sb = sb ?? new StringBuilder();
AppendView(viewGroup);
spacing += " ";
for (int i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
if (child is ViewGroup childViewGroup)
{
ShowDescendants(childViewGroup, sb, spacing, viewOfInterest);
}
else
{
AppendView(child);
}
}
return(sb.ToString());
void AppendView(View view)
{
sb.AppendLine($"{spacing}{(view == viewOfInterest ? "*" : "")}>{view.ToString()}-({ViewHelper.PhysicalToLogicalPixels(view.Width)}x{ViewHelper.PhysicalToLogicalPixels(view.Height)})");
}
}
public void wrapTabIndicatorToTitle(TabLayout tabLayout, int externalMargin, int internalMargin)
{
View tabStrip = tabLayout.GetChildAt(0);
if (tabStrip is ViewGroup)
{
ViewGroup tabStripGroup = (ViewGroup)tabStrip;
int childCount = ((ViewGroup)tabStrip).ChildCount;
for (int i = 0; i < childCount; i++)
{
View tabView = tabStripGroup.GetChildAt(i);
tabView.SetMinimumWidth(0);
tabView.SetPadding(0, tabView.PaddingTop, 0, tabView.PaddingBottom);
if (tabView.LayoutParameters is ViewGroup.MarginLayoutParams)
{
ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams)tabView.LayoutParameters;
if (i == 0)
{
setMargin(layoutParams, externalMargin, internalMargin);
}
else if (i == childCount - 1)
{
setMargin(layoutParams, internalMargin, externalMargin);
}
else
{
setMargin(layoutParams, internalMargin, internalMargin);
}
}
}
tabLayout.RequestLayout();
}
}
public static T FindChildOfType <T>(this ViewGroup parent) where T : View
{
if (parent == null)
{
return(null);
}
for (var i = 0; i < parent.ChildCount; i++)
{
var child = parent.GetChildAt(i);
if (child is T typedChild)
{
return(typedChild);
}
if (!(child is ViewGroup))
{
continue;
}
var result = FindChildOfType <T>(child as ViewGroup);
if (result != null)
{
return(result);
}
}
return(null);
}
