| OLD | NEW |
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| 1 Sky Rendering | 1 Sky Rendering |
| 2 ============= | 2 ============= |
| 3 | 3 |
| 4 The Sky render tree is a low-level layout and painting system based on a | 4 The Sky render tree is a low-level layout and painting system based on a |
| 5 retained tree of objects that inherit from [`RenderObject`](object.dart). Most | 5 retained tree of objects that inherit from [`RenderObject`](object.dart). Most |
| 6 developers using Sky will not need to interact directly with the rendering tree. | 6 developers using Sky will not need to interact directly with the rendering tree. |
| 7 Instead, most developers should use [Sky widgets](../widgets/README.md), which | 7 Instead, most developers should use [Sky widgets](../widgets/README.md), which |
| 8 are built using the render tree. | 8 are built using the render tree. |
| 9 | 9 |
| 10 Overview | 10 Overview |
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| 78 ### Parent Data | 78 ### Parent Data |
| 79 | 79 |
| 80 TODO(ianh): Describe the parent data concept. | 80 TODO(ianh): Describe the parent data concept. |
| 81 | 81 |
| 82 The `setParentData()` method is automatically called for each child | 82 The `setParentData()` method is automatically called for each child |
| 83 when the child's parent is changed. However, if you need to | 83 when the child's parent is changed. However, if you need to |
| 84 preinitialise the `parentData` member to set its values before you add | 84 preinitialise the `parentData` member to set its values before you add |
| 85 a node to its parent, you can preemptively call that future parent's | 85 a node to its parent, you can preemptively call that future parent's |
| 86 `setParentData()` method with the future child as the argument. | 86 `setParentData()` method with the future child as the argument. |
| 87 | 87 |
| 88 TODO(ianh): Discuss putting per-child configuration information for |
| 89 the parent on the child's parentData. |
| 90 |
| 91 If you change a child's parentData dynamically, you must also call |
| 92 markNeedsLayout() on the parent, otherwise the new information will |
| 93 not take effect until something else triggers a layout. |
| 94 |
| 88 ### Box Model | 95 ### Box Model |
| 89 | 96 |
| 90 #### Dimensions | 97 #### Dimensions |
| 91 | 98 |
| 92 All dimensions are expressed as logical pixel units. Font sizes are | 99 All dimensions are expressed as logical pixel units. Font sizes are |
| 93 also in logical pixel units. Logical pixel units are approximately | 100 also in logical pixel units. Logical pixel units are approximately |
| 94 96dpi, but the precise value varies based on the hardware, in such a | 101 96dpi, but the precise value varies based on the hardware, in such a |
| 95 way as to optimise for performance and rendering quality while keeping | 102 way as to optimise for performance and rendering quality while keeping |
| 96 interfaces roughly the same size across devices regardless of the | 103 interfaces roughly the same size across devices regardless of the |
| 97 hardware pixel density. | 104 hardware pixel density. |
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| 352 | 359 |
| 353 * Avoid using save/restore on canvases. | 360 * Avoid using save/restore on canvases. |
| 354 | 361 |
| 355 | 362 |
| 356 Dependencies | 363 Dependencies |
| 357 ------------ | 364 ------------ |
| 358 | 365 |
| 359 * [`package:sky/base`](../base) | 366 * [`package:sky/base`](../base) |
| 360 * [`package:sky/mojo`](../mojo) | 367 * [`package:sky/mojo`](../mojo) |
| 361 * [`package:sky/animation`](../mojo) | 368 * [`package:sky/animation`](../mojo) |
| OLD | NEW |
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Chromium Code Reviews
Issue 1213473003:
Add asserts to catch potential misuses of the rendering framework. (Closed)
Base URL: https://github.com/domokit/mojo.git@master