On a dwell during scroll, the scroll target point is changed. This occurs in AutoclickDragEventRewriter::RewriteEvent.Ī final synthetic mouse event for ui::ET_MOUSE_RELEASED is created at the second dwell, and the AutoclickDragEventRewriter is disabled. An AutoclickDragEventRewriter is enabled and begins re-writing all MOUSE_MOVED events to MOUSE_DRAGGED events to create the illusion of a drag. Click-and-dragĪ synthetic mouse event for ui::ET_MOUSE_PRESSED is created at the first dwell. For double-click, a second press and release pair are also sent. Synthetic mouse events for ui::ET_MOUSE_PRESSED and ui::ET_MOUSE_RELEASED are created with the appropriate mouse button flags, and sent to the WindowTreeHost under the target point for processing. But, if the target was not over the bubble, a synthetic event is generated as follows: Left-click, right-click and double-click This keeps focus from shifting and things like dialogs or context menus from closing when the user interacts with an autoclick bubble. If it is over a bubble the gesture will not be handled with a synthetic event, but instead sent directly to that menu. This function first checks if the target point is over either of the autoclick bubbles, the menu or the scroll bubble. When the autoclick_timer_ completes it calls AutoclickController::DoAutoclickAction. Performing the click is controlled by the autoclick_timer_. There is a small delay before the user sees the count-down timer ring UI appear (AutoclickRingHandler) show up, which is controlled by the start_gesture_timer_. How it worksĪutoclickController is a pre-target EventHandler with very high priority, which means it can receive and act on mouse events before other parts of Chrome OS get them.ĪutoclickController::OnMouseEvent receives mouse events and checks whether the event is close to the current dwell target (in which case dwell count-down should continue), or far enough away to clear the target and set a new one. Now open in a separate instance of the browser, and debug the Accessibility Common extension background page from there. Start Chrome OS on Linux with this command-line flag: out/Release/chrome -remote-debugging-port=9222 To debug the Accessibility Common extension, the easiest way is from an external browser. Out/Release/browser_tests -gtest_filter=”Autoclick*”ĭevelopers can add log lines to any of the autoclick C++ files and see output in the console. Tests are in ash_unittests and in browser_tests: out/Release/ash_unittests -gtest_filter=”Autoclick*” In addition, there are settings for automatic clicks in chrome/browser/resources/settings/a11y_page/manage_a11y_page.* Tests UI through menu bubbles and their controllers, in ash/system/accessibility/autoclick*Ī component extension to provide Accessibility tree information, in chrome/browser/resources/chromeos/accessibility/accessibility_common/
#Autoclicker chrome code
Developing Code locationĪutomatic clicks code lives mainly in three places:Ī controller, event-rewriter, and widgets to draw around click locations, in ash/autoclick/ Use, filing bugs under the component UI>Accessibility with the label “autoclick” (or, use this template). There is also a button to re-position the menu to another corner of the screen. Dwell over this menu to change the action taken, or pause the feature. You can adjust timing, radius, stabilization, and whether to revert to a left-click after another type of action has been taken from the settings page.Ī on-screen menu bubble will appear in the corner.
Go to Chrome settings, Accessibility settings, “Manage accessibility Features”, and in the “mouse and input” section enable “Automatically click when the cursor stops”. A user who is unable to use a mouse or unable to click with a mouse, but who is able to control the cursor position (often using an alternative input method) will need to use dwell control to perform mouse or trackpad actions, including left-click, right-click, double-click, click-and-drag and scroll. Automatic clicks is a Chrome OS feature to automatically generate mouse events when the cursor dwells in one location.ĭwell control supports users with motor impairments.
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