src/Tizen.NUI.Components/Controls/Button.Internal.cs

   1 /*
   2  * Copyright(c) 2021 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 using System;
  19 using System.ComponentModel;
  20 using System.Diagnostics;
  21 using Tizen.NUI.BaseComponents;
  22 using Tizen.NUI.Components.Extension;
  23 using Tizen.NUI.Accessibility; // To use AccessibilityManager
  24
  25 namespace Tizen.NUI.Components
  26 {
  27     public partial class Button
  28     {
  29         private ImageView overlayImage;
  30         private TextLabel buttonText;
  31         private ImageView buttonIcon;
  32         private Vector2 size;
  33
  34         private EventHandler<StateChangedEventArgs> stateChangeHandler;
  35
  36         private bool isPressed = false;
  37         private bool styleApplied = false;
  38
  39         /// <summary>
  40         /// Get accessibility name.
  41         /// </summary>
  42         [EditorBrowsable(EditorBrowsableState.Never)]
  43         protected override string AccessibilityGetName()
  44         {
  45             return Text;
  46         }
  47
  48         /// <summary>
  49         /// Prevents from showing child widgets in AT-SPI tree.
  50         /// </summary>
  51         [EditorBrowsable(EditorBrowsableState.Never)]
  52         protected override bool AccessibilityShouldReportZeroChildren()
  53         {
  54             return true;
  55         }
  56
  57         /// <summary>
  58         /// The ButtonExtension instance that is injected by ButtonStyle.
  59         /// </summary>
  60         [EditorBrowsable(EditorBrowsableState.Never)]
  61         protected ButtonExtension Extension { get; set; }
  62
  63         /// <summary>
  64         /// Creates Button's text part.
  65         /// </summary>
  66         /// <return>The created Button's text part.</return>
  67         [EditorBrowsable(EditorBrowsableState.Never)]
  68         protected virtual TextLabel CreateText()
  69         {
  70             return new TextLabel(new TextLabelStyle())
  71             {
  72                 HorizontalAlignment = HorizontalAlignment.Center,
  73                 VerticalAlignment = VerticalAlignment.Center,
  74                 AccessibilityHighlightable = false,
  75             };
  76         }
  77
  78         /// <summary>
  79         /// Creates Button's icon part.
  80         /// </summary>
  81         /// <return>The created Button's icon part.</return>
  82         [EditorBrowsable(EditorBrowsableState.Never)]
  83         protected virtual ImageView CreateIcon()
  84         {
  85             return new ImageView()
  86             {
  87                 AccessibilityHighlightable = false
  88             };
  89         }
  90
  91         /// <summary>
  92         /// Creates Button's overlay image part.
  93         /// </summary>
  94         /// <return>The created Button's overlay image part.</return>
  95         [EditorBrowsable(EditorBrowsableState.Never)]
  96         protected virtual ImageView CreateOverlayImage()
  97         {
  98             return new ImageView
  99             {
 100                 PositionUsesPivotPoint = true,
 101                 ParentOrigin = NUI.ParentOrigin.Center,
 102                 PivotPoint = NUI.PivotPoint.Center,
 103                 WidthResizePolicy = ResizePolicyType.FillToParent,
 104                 HeightResizePolicy = ResizePolicyType.FillToParent,
 105                 AccessibilityHighlightable = false
 106             };
 107         }
 108
 109         /// <summary>
 110         /// Called when the Button is Clicked by a user
 111         /// </summary>
 112         /// <param name="eventArgs">The click information.</param>
 113         [EditorBrowsable(EditorBrowsableState.Never)]
 114         protected virtual void OnClicked(ClickedEventArgs eventArgs)
 115         {
 116         }
 117
 118         /// <summary>
 119         /// Get Button style.
 120         /// </summary>
 121         /// <returns>The default button style.</returns>
 122         /// <since_tizen> 8 </since_tizen>
 123         protected override ViewStyle CreateViewStyle()
 124         {
 125             return new ButtonStyle();
 126         }
 127
 128         /// This will be public opened in tizen_5.5 after ACR done. Before ACR, need to be hidden as inhouse API.
 129         [EditorBrowsable(EditorBrowsableState.Never)]
 130         protected override void OnUpdate()
 131         {
 132             base.OnUpdate();
 133             Extension?.OnRelayout(this);
 134         }
 135
 136         /// <inheritdoc/>
 137         [EditorBrowsable(EditorBrowsableState.Never)]
 138         protected override bool HandleControlStateOnTouch(Touch touch)
 139         {
 140             if (!IsEnabled || null == touch)
 141             {
 142                 return false;
 143             }
 144
 145             PointStateType state = touch.GetState(0);
 146
 147             switch (state)
 148             {
 149                 case PointStateType.Down:
 150                     isPressed = true;
 151                     Extension?.SetTouchInfo(touch);
 152                     UpdateState();
 153                     return true;
 154                 case PointStateType.Interrupted:
 155                     isPressed = false;
 156                     UpdateState();
 157                     return true;
 158                 case PointStateType.Up:
 159                     {
 160                         if (!isPressed)
 161                         {
 162                             return false;
 163                         }
 164
 165                         isPressed = false;
 166
 167                         if (IsSelectable)
 168                         {
 169                             Extension?.SetTouchInfo(touch);
 170                             IsSelected = !IsSelected;
 171                         }
 172                         else
 173                         {
 174                             Extension?.SetTouchInfo(touch);
 175                             UpdateState();
 176                         }
 177
 178                         ClickedEventArgs eventArgs = new ClickedEventArgs();
 179                         OnClickedInternal(eventArgs);
 180
 181                         return true;
 182                     }
 183                 default:
 184                     break;
 185             }
 186             return base.HandleControlStateOnTouch(touch);
 187         }
 188
 189         /// <inheritdoc/>
 190         [EditorBrowsable(EditorBrowsableState.Never)]
 191         protected override void OnEnabled(bool enabled)
 192         {
 193             base.OnEnabled(enabled);
 194             UpdateState();
 195         }
 196
 197         /// <summary>
 198         /// Update Button State.
 199         /// </summary>
 200         /// <since_tizen> 6 </since_tizen>
 201         /// This will be public opened in tizen_5.5 after ACR done. Before ACR, need to be hidden as inhouse API.
 202         [EditorBrowsable(EditorBrowsableState.Never)]
 203         protected void UpdateState()
 204         {
 205             if (!styleApplied) return;
 206
 207             ControlState sourceState = ControlState;
 208             ControlState targetState;
 209
 210             // Normal, Disabled
 211             targetState = IsEnabled ? ControlState.Normal : ControlState.Disabled;
 212
 213             // Selected, DisabledSelected
 214             if (IsSelected) targetState += ControlState.Selected;
 215
 216             // Pressed, PressedSelected
 217             if (isPressed) targetState += ControlState.Pressed;
 218
 219             // Focused, FocusedPressed, FocusedPressedSelected, DisabledFocused, DisabledSelectedFocused
 220             if (IsFocused) targetState += ControlState.Focused;
 221
 222             if (sourceState != targetState)
 223             {
 224                 ControlState = targetState;
 225                 OnUpdate();
 226
 227                 StateChangedEventArgs e = new StateChangedEventArgs
 228                 {
 229                     PreviousState = ControlStatesExtension.FromControlStateClass(sourceState),
 230                     CurrentState = ControlStatesExtension.FromControlStateClass(targetState)
 231                 };
 232                 stateChangeHandler?.Invoke(this, e);
 233
 234                 Extension?.OnControlStateChanged(this, new ControlStateChangedEventArgs(sourceState, targetState));
 235             }
 236         }
 237
 238         /// <summary>
 239         /// Dispose Button and all children on it.
 240         /// </summary>
 241         /// <param name="type">Dispose type.</param>
 242         /// <since_tizen> 6 </since_tizen>
 243         protected override void Dispose(DisposeTypes type)
 244         {
 245             if (disposed)
 246             {
 247                 return;
 248             }
 249
 250             if (type == DisposeTypes.Explicit)
 251             {
 252                 Extension?.OnDispose(this);
 253
 254                 if (buttonIcon != null)
 255                 {
 256                     Utility.Dispose(buttonIcon);
 257                 }
 258                 if (buttonText != null)
 259                 {
 260                     Utility.Dispose(buttonText);
 261                 }
 262                 if (overlayImage != null)
 263                 {
 264                     Utility.Dispose(overlayImage);
 265                 }
 266             }
 267
 268             base.Dispose(type);
 269         }
 270
 271         /// <summary>
 272         /// Initializes AT-SPI object.
 273         /// </summary>
 274         [EditorBrowsable(EditorBrowsableState.Never)]
 275         public override void OnInitialize()
 276         {
 277             base.OnInitialize();
 278             SetAccessibilityConstructor(Role.PushButton);
 279
 280             AccessibilityHighlightable = true;
 281             EnableControlStatePropagation = true;
 282
 283             AccessibilityManager.Instance.SetAccessibilityAttribute(this, AccessibilityManager.AccessibilityAttribute.Trait, "Button");
 284
 285             buttonText = CreateText();
 286             buttonIcon = CreateIcon();
 287             LayoutItems();
 288
 289 #if PROFILE_MOBILE
 290             Feedback = true;
 291 #endif
 292         }
 293
 294         /// <inheritdoc/>
 295         [EditorBrowsable(EditorBrowsableState.Never)]
 296         public override void OnRelayout(Vector2 size, RelayoutContainer container)
 297         {
 298             if (size == null) return;
 299
 300             if (size.Equals(this.size))
 301             {
 302                 return;
 303             }
 304
 305             this.size = new Vector2(size);
 306
 307             UpdateSizeAndSpacing();
 308         }
 309
 310         /// <inheritdoc/>
 311         [EditorBrowsable(EditorBrowsableState.Never)]
 312         protected override void OnControlStateChanged(ControlStateChangedEventArgs controlStateChangedInfo)
 313         {
 314             base.OnControlStateChanged(controlStateChangedInfo);
 315
 316             var stateEnabled = !controlStateChangedInfo.CurrentState.Contains(ControlState.Disabled);
 317
 318             if (IsEnabled != stateEnabled)
 319             {
 320                 IsEnabled = stateEnabled;
 321             }
 322
 323             var statePressed = controlStateChangedInfo.CurrentState.Contains(ControlState.Pressed);
 324
 325             if (isPressed != statePressed)
 326             {
 327                 isPressed = statePressed;
 328             }
 329         }
 330
 331         /// <summary>
 332         /// Put sub items (e.g. buttonText, buttonIcon) to the right place.
 333         /// </summary>
 334         [EditorBrowsable(EditorBrowsableState.Never)]
 335         protected virtual void LayoutItems()
 336         {
 337             if (buttonIcon == null || buttonText == null)
 338             {
 339                 return;
 340             }
 341
 342             buttonIcon.Unparent();
 343             buttonText.Unparent();
 344             overlayImage?.Unparent();
 345
 346 #pragma warning disable CA2000
 347             Size2D cellPadding = String.IsNullOrEmpty(buttonText.Text) ? new Size2D(0, 0) : itemSpacing;
 348 #pragma warning restore CA2000
 349
 350             if (IconRelativeOrientation == IconOrientation.Left)
 351             {
 352                 Layout = new LinearLayout()
 353                 {
 354                     LinearOrientation = LinearLayout.Orientation.Horizontal,
 355                     LinearAlignment = itemAlignment,
 356                     CellPadding = cellPadding
 357                 };
 358
 359                 Add(buttonIcon);
 360                 Add(buttonText);
 361             }
 362             else if (IconRelativeOrientation == IconOrientation.Right)
 363             {
 364                 Layout = new LinearLayout()
 365                 {
 366                     LinearOrientation = LinearLayout.Orientation.Horizontal,
 367                     LinearAlignment = itemAlignment,
 368                     CellPadding = cellPadding
 369                 };
 370
 371                 Add(buttonText);
 372                 Add(buttonIcon);
 373             }
 374             else if (IconRelativeOrientation == IconOrientation.Top)
 375             {
 376                 Layout = new LinearLayout()
 377                 {
 378                     LinearOrientation = LinearLayout.Orientation.Vertical,
 379                     LinearAlignment = itemAlignment,
 380                     CellPadding = cellPadding
 381                 };
 382
 383                 Add(buttonIcon);
 384                 Add(buttonText);
 385             }
 386             else if (IconRelativeOrientation == IconOrientation.Bottom)
 387             {
 388                 Layout = new LinearLayout()
 389                 {
 390                     LinearOrientation = LinearLayout.Orientation.Vertical,
 391                     LinearAlignment = itemAlignment,
 392                     CellPadding = cellPadding
 393                 };
 394
 395                 Add(buttonText);
 396                 Add(buttonIcon);
 397             }
 398
 399             if (overlayImage != null)
 400             {
 401                 overlayImage.ExcludeLayouting = true;
 402                 Add(overlayImage);
 403             }
 404         }
 405
 406         private void UpdateSizeAndSpacing()
 407         {
 408             if (size == null || buttonIcon == null || buttonText == null)
 409             {
 410                 return;
 411             }
 412
 413             LinearLayout layout = Layout as LinearLayout;
 414
 415             if (layout == null)
 416             {
 417                 return;
 418             }
 419
 420             float lengthWithoutText = 0;
 421             Size2D cellPadding = null;
 422             Extents iconMargin = buttonIcon.Margin ?? new Extents(0);
 423             Extents textMargin = buttonText.Margin ?? new Extents(0);
 424
 425             if (buttonIcon.Size.Width != 0 && buttonIcon.Size.Height != 0)
 426             {
 427                 lengthWithoutText = buttonIcon.Size.Width;
 428
 429                 if (!String.IsNullOrEmpty(buttonText.Text))
 430                 {
 431                     cellPadding = itemSpacing;
 432
 433                     if (iconRelativeOrientation == IconOrientation.Left || iconRelativeOrientation == IconOrientation.Right)
 434                     {
 435                         lengthWithoutText += (itemSpacing?.Width ?? 0) + iconMargin.Start + iconMargin.End + textMargin.Start + textMargin.End;
 436                     }
 437                     else
 438                     {
 439                         lengthWithoutText += (itemSpacing?.Height ?? 0) + iconMargin.Top + iconMargin.Bottom + textMargin.Top + textMargin.Bottom;
 440                     }
 441                 }
 442             }
 443
 444             layout.CellPadding = cellPadding ?? new Size2D(0, 0);
 445
 446             // If the button has fixed width and the text is not empty, the text should not exceed button boundary.
 447             if (WidthSpecification != LayoutParamPolicies.WrapContent && !String.IsNullOrEmpty(buttonText.Text))
 448             {
 449                 buttonText.MaximumSize = new Size2D((int)Math.Max(size.Width - lengthWithoutText, Math.Max(buttonText.MinimumSize.Width, 1)), (int)size.Height);
 450             }
 451         }
 452
 453         private void OnClickedInternal(ClickedEventArgs eventArgs)
 454         {
 455             Command?.Execute(CommandParameter);
 456             OnClicked(eventArgs);
 457             Extension?.OnClicked(this, eventArgs);
 458
 459             ClickEventArgs nestedEventArgs = new ClickEventArgs();
 460             ClickEvent?.Invoke(this, nestedEventArgs);
 461             Clicked?.Invoke(this, eventArgs);
 462         }
 463     }
 464 }