Native windows and the owner-draw approach used in many WindowsĪpplications.

ConstrainedWindowImpl: A subclass of Window that provides the frame for constrained dialogs such as the HTTP basic auth prompt.Īt the start of the project, we began building the Chromium browser using.BrowserFrame: A subclass of Window that provides additional message processing for the Browser window in Chrome.All base views classes are in the ' views' namespace. The base set of classes and interfaces provided by views can be found in the src/ui/views/ directory.

Many platform independent types that we can eventually replace these Take Windows or ATL types, but we have since augmented ui/gfx/ with For historical reasons, many of View's functions Things based on system metrics, and so on, the rest of the View system is notĮspecially unportable, since most rendering is done using the cross-platform Skia library. These Views are also not especially portable, except perhaps in API.īarring platform-specific rendering code, code that sizes These are used for buttons, tables, radio buttons, checkboxes, Special kind of View that knows how to display and size a native Rather, they are native Windows controls hosted within a Several UI controls in Chromium's UI are not rendered using Views, however. Rendering itself is done using aĬombination of Skia and GDI calls - GDI for text and Skia for Single canvas set up and owned by the Widget when it receives a Paint message. Rendering for the entire View tree is done into a Method), and so when it is asked to Paint, it paints into a canvasĬlipped to its bounds, with the origin of rendering translated to the Own bounds (often imbued upon it by its containing View's Layout Then begins propagation of the event into the View hierarchy.Īnd layout are done in a similar way. Understand, and then passes them to the RootView.

Windows, converts them into something the View hierarchy can Each View in the tree representsĪ different component of the UI. An analog is the hierarchicalĪt the root of a View hierarchy is a Widget , Views is a rendering system not unlike that used in WebKit On Windows to accelerate our development of custom UI. System provides a few basic controls and native window containers, butīuilding a custom user interface is difficult. Since we desired aĭifferentiated aesthetic for Chromium, we have had to build a framework Windows provides very primitive tools for building user interfaces.

View s in chrome