зеркало из https://github.com/DeGsoft/maui-linux.git
Implemented Editor Placeholder and PlaceholderColor in GTK (#3135)
This commit is contained in:
Javier Suárez Ruiz
Stephane Delcroix
Родитель
295bcdfe5e
Коммит
673cffb1ab
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@ -2,45 +2,134 @@
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namespace Xamarin.Forms.Platform.GTK.Controls
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{
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public class ScrolledTextView : ScrolledWindow
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{
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private TextView _textView;
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private int _maxLength;
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public class ScrolledTextView : EventBox
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{
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private Table _table;
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private ScrolledWindow _scrolledWindow;
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private Gtk.Label _placeholder;
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private EventBox _placeholderContainer;
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private int _maxLength;
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public ScrolledTextView()
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{
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ShadowType = ShadowType.In;
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HscrollbarPolicy = PolicyType.Never;
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VscrollbarPolicy = PolicyType.Always;
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public ScrolledTextView()
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{
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_table = new Table(1, 1, true);
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_textView = new TextView
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{
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AcceptsTab = false,
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WrapMode = WrapMode.WordChar
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};
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TextView = new TextView
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{
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AcceptsTab = false,
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WrapMode = WrapMode.WordChar
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};
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_textView.Buffer.InsertText += InsertText;
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Add(_textView);
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}
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TextView.Buffer.InsertText += InsertText;
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TextView.FocusOutEvent += FocusedOut;
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public TextView TextView => _textView;
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_scrolledWindow = new ScrolledWindow
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{
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ShadowType = ShadowType.In,
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HscrollbarPolicy = PolicyType.Never,
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VscrollbarPolicy = PolicyType.Automatic
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};
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public void SetMaxLength(int maxLength)
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{
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_maxLength = maxLength;
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_scrolledWindow.Add(TextView);
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if (_textView.Buffer.CharCount > maxLength)
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_textView.Buffer.Text = _textView.Buffer.Text.Substring(0, maxLength);
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}
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_placeholder = new Gtk.Label();
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_placeholder.SetAlignment(0, 0);
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protected override void OnFocusGrabbed()
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{
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_textView?.GrabFocus();
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}
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_placeholderContainer = new EventBox
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{
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BorderWidth = 2
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};
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void InsertText(object o, InsertTextArgs args)
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{
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args.RetVal = args.Length <= _maxLength;
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}
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}
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_placeholderContainer.Add(_placeholder);
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_placeholderContainer.ButtonPressEvent += PlaceHolderContainerPressed;
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SetBackgroundColor(TextView.Style.BaseColors[(int)StateType.Normal]);
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Add(_table);
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_table.Attach(_placeholderContainer, 0, 1, 0, 1, AttachOptions.Fill, AttachOptions.Fill, 0, 0);
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_table.Attach(_scrolledWindow, 0, 1, 0, 1);
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}
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public TextView TextView { get; }
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public string PlaceholderText
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{
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get
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{
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return _placeholder.Text;
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}
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set
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{
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_placeholder.Text = GLib.Markup.EscapeText(value ?? string.Empty);
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}
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}
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public void SetBackgroundColor(Gdk.Color color)
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{
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ModifyBg(StateType.Normal, color);
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TextView.ModifyBase(StateType.Normal, color);
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_placeholderContainer.ModifyBg(StateType.Normal, color);
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}
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public void SetPlaceholderTextColor(Gdk.Color color)
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{
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_placeholder.ModifyFg(StateType.Normal, color);
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}
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public void SetMaxLength(int maxLength)
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{
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_maxLength = maxLength;
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if (TextView.Buffer.CharCount > maxLength)
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TextView.Buffer.Text = TextView.Buffer.Text.Substring(0, maxLength);
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}
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protected override void OnFocusGrabbed()
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{
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TextView?.GrabFocus();
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}
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protected override void OnSizeAllocated(Gdk.Rectangle allocation)
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{
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base.OnSizeAllocated(allocation);
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TextView.SetSizeRequest(allocation.Width, allocation.Height);
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ShowPlaceholderIfNeeded();
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}
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private void InsertText(object o, InsertTextArgs args)
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{
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args.RetVal = args.Length <= _maxLength;
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}
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private void FocusedOut(object o, FocusOutEventArgs args)
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{
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ShowPlaceholderIfNeeded();
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}
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private void ShowPlaceholderIfNeeded()
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{
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if (string.IsNullOrEmpty(TextView.Buffer.Text) && !string.IsNullOrEmpty(_placeholder.Text))
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{
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_placeholderContainer.VisibleWindow = true;
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}
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else
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{
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_placeholderContainer.VisibleWindow = false;
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}
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}
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private void PlaceHolderContainerPressed(object o, ButtonPressEventArgs args)
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{
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if (Sensitive)
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{
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TextView.Sensitive = true;
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TextView.HasFocus = true;
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TextView.GdkWindow?.Raise();
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}
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}
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}
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}
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@ -8,158 +8,182 @@ using Xamarin.Forms.Platform.GTK.Helpers;
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namespace Xamarin.Forms.Platform.GTK.Renderers
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{
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public class EditorRenderer : ViewRenderer<Editor, ScrolledTextView>
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{
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private const string TextColorTagName = "text-color";
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public class EditorRenderer : ViewRenderer<Editor, ScrolledTextView>
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{
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private const string TextColorTagName = "text-color";
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private bool _disposed;
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private bool _disposed;
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protected IEditorController EditorController => Element as IEditorController;
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protected IEditorController EditorController => Element as IEditorController;
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protected override void UpdateBackgroundColor()
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{
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if (!Element.BackgroundColor.IsDefaultOrTransparent())
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{
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var color = Element.BackgroundColor.ToGtkColor();
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protected override void UpdateBackgroundColor()
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{
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if (!Element.BackgroundColor.IsDefaultOrTransparent())
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{
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var backgroundColor = Element.BackgroundColor.ToGtkColor();
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Control.TextView.ModifyBg(StateType.Normal, color);
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Control.TextView.ModifyBase(StateType.Normal, color);
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}
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}
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Control.SetBackgroundColor(backgroundColor);
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}
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}
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protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
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{
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if (Control == null)
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{
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var scrolled = new ScrolledTextView();
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protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
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{
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if (Control == null)
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{
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var scrolled = new ScrolledTextView();
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scrolled.TextView.Buffer.TagTable.Add(new TextTag(TextColorTagName));
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scrolled.TextView.Buffer.Changed += TextViewBufferChanged;
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scrolled.TextView.Focused += TextViewFocused;
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scrolled.TextView.FocusOutEvent += TextViewFocusedOut;
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scrolled.TextView.Buffer.TagTable.Add(new TextTag(TextColorTagName));
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SetNativeControl(scrolled);
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AdjustMinimumHeight(scrolled.TextView);
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}
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scrolled.TextView.Buffer.Changed += TextViewBufferChanged;
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scrolled.TextView.Focused += TextViewFocused;
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scrolled.TextView.FocusOutEvent += TextViewFocusedOut;
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if (e.NewElement != null)
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{
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UpdateText();
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UpdateFont();
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UpdateTextColor();
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UpdateMaxLength();
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}
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SetNativeControl(scrolled);
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AdjustMinimumHeight(scrolled.TextView);
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}
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base.OnElementChanged(e);
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}
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if (e.NewElement != null)
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{
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UpdateText();
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UpdateFont();
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UpdateTextColor();
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UpdatePlaceholder();
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UpdatePlaceholderColor();
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UpdateMaxLength();
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}
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protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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base.OnElementPropertyChanged(sender, e);
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base.OnElementChanged(e);
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}
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if (e.PropertyName == Editor.TextProperty.PropertyName)
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UpdateText();
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else if (e.PropertyName == Editor.TextColorProperty.PropertyName)
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UpdateTextColor();
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else if (e.PropertyName == Editor.FontAttributesProperty.PropertyName)
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UpdateFont();
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else if (e.PropertyName == Editor.FontFamilyProperty.PropertyName)
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UpdateFont();
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else if (e.PropertyName == Editor.FontSizeProperty.PropertyName)
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UpdateFont();
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else if (e.PropertyName == InputView.MaxLengthProperty.PropertyName)
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UpdateMaxLength();
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}
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protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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base.OnElementPropertyChanged(sender, e);
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protected override void Dispose(bool disposing)
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{
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if (disposing && !_disposed)
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{
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_disposed = true;
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if (e.PropertyName == Editor.TextProperty.PropertyName)
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UpdateText();
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else if (e.PropertyName == Editor.TextColorProperty.PropertyName)
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UpdateTextColor();
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else if (e.PropertyName == Editor.PlaceholderProperty.PropertyName)
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UpdatePlaceholder();
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else if (e.PropertyName == Editor.PlaceholderColorProperty.PropertyName)
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UpdatePlaceholderColor();
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else if (e.PropertyName == Editor.FontAttributesProperty.PropertyName)
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UpdateFont();
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else if (e.PropertyName == Editor.FontFamilyProperty.PropertyName)
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UpdateFont();
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else if (e.PropertyName == Editor.FontSizeProperty.PropertyName)
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UpdateFont();
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else if (e.PropertyName == InputView.MaxLengthProperty.PropertyName)
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UpdateMaxLength();
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}
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if (Control != null)
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{
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Control.TextView.Buffer.Changed -= TextViewBufferChanged;
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Control.TextView.Focused -= TextViewFocused;
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Control.TextView.FocusOutEvent += TextViewFocusedOut;
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}
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}
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protected override void Dispose(bool disposing)
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{
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if (disposing && !_disposed)
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{
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_disposed = true;
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base.Dispose(disposing);
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}
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if (Control != null)
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{
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Control.TextView.Buffer.Changed -= TextViewBufferChanged;
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Control.TextView.Focused -= TextViewFocused;
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Control.TextView.FocusOutEvent += TextViewFocusedOut;
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}
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}
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private void UpdateText()
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{
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TextBuffer buffer = Control.TextView.Buffer;
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base.Dispose(disposing);
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}
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if (buffer.Text != Element.Text)
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{
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buffer.Text = Element.Text ?? string.Empty;
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UpdateTextColor();
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}
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}
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private void UpdateText()
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{
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TextBuffer buffer = Control.TextView.Buffer;
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private void UpdateFont()
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{
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FontDescription fontDescription = FontDescriptionHelper.CreateFontDescription(
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Element.FontSize, Element.FontFamily, Element.FontAttributes);
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Control.TextView.ModifyFont(fontDescription);
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if (buffer.Text != Element.Text)
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{
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buffer.Text = Element.Text ?? string.Empty;
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UpdateTextColor();
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}
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}
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AdjustMinimumHeight(Control.TextView, fontDescription);
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}
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private void UpdateFont()
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{
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FontDescription fontDescription = FontDescriptionHelper.CreateFontDescription(
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Element.FontSize, Element.FontFamily, Element.FontAttributes);
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Control.TextView.ModifyFont(fontDescription);
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private void UpdateTextColor()
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{
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if (!Element.TextColor.IsDefaultOrTransparent())
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{
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var textColor = Element.TextColor.ToGtkColor();
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AdjustMinimumHeight(Control.TextView, fontDescription);
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}
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TextBuffer buffer = Control.TextView.Buffer;
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TextTag tag = buffer.TagTable.Lookup(TextColorTagName);
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tag.ForegroundGdk = Element.IsEnabled ? textColor : Control.Style.Foregrounds[(int)StateType.Normal];
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Control.TextView.Buffer.ApplyTag(tag, buffer.StartIter, buffer.EndIter);
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}
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}
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private void UpdateTextColor()
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{
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if (!Element.TextColor.IsDefaultOrTransparent())
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{
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var textColor = Element.TextColor.ToGtkColor();
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private void TextViewBufferChanged(object sender, EventArgs e)
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{
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TextBuffer buffer = Control.TextView.Buffer;
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TextBuffer buffer = Control.TextView.Buffer;
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TextTag tag = buffer.TagTable.Lookup(TextColorTagName);
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tag.ForegroundGdk = Element.IsEnabled ? textColor : Control.Style.Foregrounds[(int)StateType.Normal];
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Control.TextView.Buffer.ApplyTag(tag, buffer.StartIter, buffer.EndIter);
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}
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}
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if (Element.Text != buffer.Text)
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ElementController.SetValueFromRenderer(Editor.TextProperty, buffer.Text);
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private void TextViewBufferChanged(object sender, EventArgs e)
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{
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TextBuffer buffer = Control.TextView.Buffer;
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UpdateTextColor();
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}
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if (Element.Text != buffer.Text)
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ElementController.SetValueFromRenderer(Editor.TextProperty, buffer.Text);
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private void TextViewFocused(object o, FocusedArgs args)
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{
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ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
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}
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UpdateTextColor();
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}
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private void TextViewFocusedOut(object o, FocusOutEventArgs args)
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{
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ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
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EditorController.SendCompleted();
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}
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private void TextViewFocused(object o, FocusedArgs args)
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{
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ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
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}
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private static void AdjustMinimumHeight(TextView textView, FontDescription font = null)
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{
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var fDescr = font != null ? font : textView.Style.FontDescription;
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var metrics = textView.PangoContext.GetMetrics(font, Language.Default);
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var pangoUnits = (metrics.Ascent + metrics.Descent) / Pango.Scale.PangoScale;
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private void TextViewFocusedOut(object o, FocusOutEventArgs args)
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{
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ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
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EditorController.SendCompleted();
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}
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var resolution = textView.Screen.Resolution;
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var minHeight = (int)(pangoUnits * (resolution / 72.0));
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private static void AdjustMinimumHeight(TextView textView, FontDescription font = null)
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{
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var fDescr = font != null ? font : textView.Style.FontDescription;
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var metrics = textView.PangoContext.GetMetrics(font, Language.Default);
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var pangoUnits = (metrics.Ascent + metrics.Descent) / Pango.Scale.PangoScale;
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if (textView.HeightRequest < minHeight)
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{
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textView.HeightRequest = minHeight;
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}
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}
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var resolution = textView.Screen.Resolution;
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var minHeight = (int)(pangoUnits * (resolution / 72.0));
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private void UpdateMaxLength()
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{
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Control.SetMaxLength(Element.MaxLength);
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}
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}
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if (textView.HeightRequest < minHeight)
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{
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textView.HeightRequest = minHeight;
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}
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}
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private void UpdateMaxLength()
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{
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Control.SetMaxLength(Element.MaxLength);
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}
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private void UpdatePlaceholder()
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{
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if (Element.Placeholder != Control.PlaceholderText)
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{
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Control.PlaceholderText = Element.Placeholder;
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}
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}
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private void UpdatePlaceholderColor()
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{
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if (!Element.PlaceholderColor.IsDefaultOrTransparent())
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{
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var placeholderColor = Element.PlaceholderColor.ToGtkColor();
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Control.SetPlaceholderTextColor(placeholderColor);
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}
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}
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}
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}
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