summaryrefslogtreecommitdiff
path: root/Xamarin.Forms.Platform.Tizen/Native/Entry.cs
blob: d6f3f45456fafe17f2d44e514f0441c79d08d620 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
using System;
using ElmSharp;
using EEntry = ElmSharp.Entry;
using EColor = ElmSharp.Color;
using ESize = ElmSharp.Size;

namespace Xamarin.Forms.Platform.Tizen.Native
{
	/// <summary>
	/// Extends the Entry control, providing basic formatting features,
	/// i.e. font color, size, placeholder.
	/// </summary>
	public class Entry : EEntry, IMeasurable
	{
		/// <summary>
		/// Holds the formatted text of the entry.
		/// </summary>
		readonly Span _span = new Span();

		/// <summary>
		/// Holds the formatted text of the placeholder.
		/// </summary>
		readonly Span _placeholderSpan = new Span();

		/// <summary>
		/// Helps to detect whether the text change was initiated by the user
		/// or via the Text property.
		/// </summary>
		int _changedByUserCallbackDepth;

		/// <summary>
		/// The type of the keyboard used by the entry.
		/// </summary>
		Keyboard _keyboard;

		/// <summary>
		/// Initializes a new instance of the <see cref="Xamarin.Forms.Platform.Tizen.Native.Entry"/> class.
		/// </summary>
		/// <param name="parent">Parent evas object.</param>
		public Entry(EvasObject parent) : base(parent)
		{
			Scrollable = true;

			ChangedByUser += (s, e) =>
			{
				_changedByUserCallbackDepth++;

				Text = GetInternalText();

				_changedByUserCallbackDepth--;
			};

			ApplyKeyboard(Keyboard.Normal);
		}

		/// <summary>
		/// Occurs when the text has changed.
		/// </summary>
		public event EventHandler<TextChangedEventArgs> TextChanged;

		/// <summary>
		/// Gets or sets the text.
		/// </summary>
		/// <value>The text.</value>
		public override string Text
		{
			get
			{
				return _span.Text;
			}

			set
			{
				if (value != _span.Text)
				{
					var old = _span.Text;
					_span.Text = value;
					ApplyTextAndStyle();
					Device.StartTimer(TimeSpan.FromTicks(1), () =>
						{
							TextChanged?.Invoke(this, new TextChangedEventArgs(old, value));
							return false;
						});
				}
			}
		}

		/// <summary>
		/// Gets or sets the color of the text.
		/// </summary>
		/// <value>The color of the text.</value>
		public EColor TextColor
		{
			get
			{
				return _span.ForegroundColor;
			}

			set
			{
				if (!_span.ForegroundColor.Equals(value))
				{
					_span.ForegroundColor = value;
					ApplyTextAndStyle();
				}
			}
		}

		/// <summary>
		/// Gets or sets the font family of the text and the placeholder.
		/// </summary>
		/// <value>The font family of the text and the placeholder.</value>
		public string FontFamily
		{
			get
			{
				return _span.FontFamily;
			}

			set
			{
				if (value != _span.FontFamily)
				{
					_span.FontFamily = value;
					ApplyTextAndStyle();

					_placeholderSpan.FontFamily = value;
					ApplyPlaceholderAndStyle();
				}
			}
		}

		/// <summary>
		/// Gets or sets the font attributes of the text and the placeholder.
		/// </summary>
		/// <value>The font attributes of the text and the placeholder.</value>
		public FontAttributes FontAttributes
		{
			get
			{
				return _span.FontAttributes;
			}

			set
			{
				if (value != _span.FontAttributes)
				{
					_span.FontAttributes = value;
					ApplyTextAndStyle();

					_placeholderSpan.FontAttributes = value;
					ApplyPlaceholderAndStyle();
				}
			}
		}


		/// <summary>
		/// Gets or sets the size of the font of both text and placeholder.
		/// </summary>
		/// <value>The size of the font of both text and placeholder.</value>
		public double FontSize
		{
			get
			{
				return _span.FontSize;
			}

			set
			{
				if (value != _span.FontSize)
				{
					_span.FontSize = value;
					ApplyTextAndStyle();

					_placeholderSpan.FontSize = value;
					ApplyPlaceholderAndStyle();
				}
			}
		}

		/// <summary>
		/// Gets or sets the font weight for the text.
		/// </summary>
		/// <value>The weight of the font.</value>
		public string FontWeight
		{
			get
			{
				return _span.FontWeight;
			}

			set
			{
				if (value != _span.FontWeight)
				{
					_span.FontWeight = value;
					ApplyTextAndStyle();

					_placeholderSpan.FontWeight = value;
					ApplyPlaceholderAndStyle();
				}
			}
		}

		/// <summary>
		/// Gets or sets the horizontal text alignment of both text and placeholder.
		/// </summary>
		/// <value>The horizontal text alignment of both text and placeholder.</value>
		public TextAlignment HorizontalTextAlignment
		{
			get
			{
				return _span.HorizontalTextAlignment;
			}

			set
			{
				if (value != _span.HorizontalTextAlignment)
				{
					_span.HorizontalTextAlignment = value;
					ApplyTextAndStyle();

					_placeholderSpan.HorizontalTextAlignment = value;
					ApplyPlaceholderAndStyle();
				}
			}
		}

		/// <summary>
		/// Gets or sets the keyboard type used by the entry.
		/// </summary>
		/// <value>The keyboard type.</value>
		public Keyboard Keyboard
		{
			get
			{
				return _keyboard;
			}

			set
			{
				if (value != _keyboard)
				{
					ApplyKeyboard(value);
				}
			}
		}

		/// <summary>
		/// Gets or sets the placeholder's text.
		/// </summary>
		/// <value>The placeholder's text.</value>
		public string Placeholder
		{
			get
			{
				return _placeholderSpan.Text;
			}

			set
			{
				if (value != _placeholderSpan.Text)
				{
					_placeholderSpan.Text = value;
					ApplyPlaceholderAndStyle();
				}
			}
		}

		/// <summary>
		/// Gets or sets the color of the placeholder's text.
		/// </summary>
		/// <value>The color of the placeholder's text.</value>
		public EColor PlaceholderColor
		{
			get
			{
				return _placeholderSpan.ForegroundColor;
			}

			set
			{
				if (!_placeholderSpan.ForegroundColor.Equals(value))
				{
					_placeholderSpan.ForegroundColor = value;
					ApplyPlaceholderAndStyle();
				}
			}
		}

		/// <summary>
		/// Implementation of the IMeasurable.Measure() method.
		/// </summary>
		public ESize Measure(int availableWidth, int availableHeight)
		{
			var originalSize = Geometry;
			// resize the control using the whole available width
			Resize(availableWidth, originalSize.Height);

			ESize rawSize;
			ESize formattedSize;
			var edjeTextBlock = EdjeObject["elm.guide"];

			// if there's no text, but there's a placeholder, use it for measurements
			if (string.IsNullOrEmpty(Text) && !string.IsNullOrEmpty(Placeholder) && edjeTextBlock != null)
			{
				rawSize = edjeTextBlock.TextBlockNativeSize;
				formattedSize = edjeTextBlock.TextBlockFormattedSize;
			}
			else
			{
				// there's text in the entry, use it instead
				rawSize = Native.TextHelper.GetRawTextBlockSize(this);
				formattedSize = Native.TextHelper.GetFormattedTextBlockSize(this);
			}

			// restore the original size
			Resize(originalSize.Width, originalSize.Height);

			// Set bottom padding for lower case letters that have segments below the bottom line of text (g, j, p, q, y).
			var verticalPadding = (int)Math.Ceiling(0.05 * FontSize);
			var horizontalPadding = (int)Math.Ceiling(0.2 * FontSize);
			rawSize.Height += verticalPadding;
			formattedSize.Height += verticalPadding;
			formattedSize.Width += horizontalPadding;

			// if the raw text width is larger than available width, we use the available width,
			// while height is set to the smallest height value
			if (rawSize.Width > availableWidth)
			{
				return new ESize
				{
					Width = availableWidth,
					Height = Math.Min(formattedSize.Height, Math.Max(rawSize.Height, availableHeight)),
				};
			}
			else
			{
				// width is fine, return the formatted text size
				return formattedSize;
			}
		}

		/// <summary>
		/// Applies entry's text and its style.
		/// </summary>
		void ApplyTextAndStyle()
		{
			SetInternalTextAndStyle(_span.GetDecoratedText(), _span.GetStyle());
		}

		/// <summary>
		/// Sets entry's internal text and its style.
		/// </summary>
		/// <param name="formattedText">Formatted text, supports HTML tags.</param>
		/// <param name="textStyle">Style applied to the formattedText.</param>
		void SetInternalTextAndStyle(string formattedText, string textStyle)
		{
			if (_changedByUserCallbackDepth == 0)
			{
				base.Text = formattedText;
				base.TextStyle = textStyle;
			}
		}

		/// <summary>
		/// Gets the internal text representation of the entry.
		/// </summary>
		/// <returns>The internal text representation.</returns>
		string GetInternalText()
		{
			return Entry.ConvertMarkupToUtf8(base.Text);
		}

		/// <summary>
		/// Applies the keyboard type to be used by the entry.
		/// </summary>
		/// <param name="keyboard">Keyboard type to be used.</param>
		void ApplyKeyboard(Keyboard keyboard)
		{
			SetInternalKeyboard(_keyboard = keyboard);
		}

		/// <summary>
		/// Configures the ElmSharp.Entry with specified keyboard type and displays
		/// the keyboard automatically unless the provided type is Keyboard.None.
		/// </summary>
		/// <param name="keyboard">Keyboard type to be used.</param>
		void SetInternalKeyboard(Keyboard keyboard)
		{
			if (keyboard == Keyboard.None)
			{
				SetInputPanelEnabled(false);
			}
			else
			{
				SetInputPanelEnabled(true);
				SetInputPanelLayout((InputPanelLayout)keyboard);
			}
		}

		/// <summary>
		/// Applies placeholders's text and its style.
		/// </summary>
		void ApplyPlaceholderAndStyle()
		{
			SetInternalPlaceholderAndStyle(_placeholderSpan.GetMarkupText());
		}

		/// <summary>
		/// Sets placeholder's internal text and style.
		/// </summary>
		/// <param name="markupText">Markup text to be used as a placeholder.</param>
		void SetInternalPlaceholderAndStyle(string markupText)
		{
			SetPartText("elm.guide", markupText ?? "");
		}
	}
}