send_mouse_down_eventT_send_mouse_down_eventSendMouseDownEventSendMouseDownEventsend_mouse_down_event (算子名称)

名称

send_mouse_down_eventT_send_mouse_down_eventSendMouseDownEventSendMouseDownEventsend_mouse_down_event — Send an event to a window buffer signaling a mouse down event.

参数签名

描述

send_mouse_down_eventsend_mouse_down_eventSendMouseDownEventSendMouseDownEventSendMouseDownEventsend_mouse_down_event sends an event at the position (RowRowRowRowrowrow, ColumnColumnColumnColumncolumncolumn) to the buffer window WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle, signaling that the mouse button encoded by ButtonButtonButtonButtonbuttonbutton has been pressed. Please refer to get_mbuttonget_mbuttonGetMbuttonGetMbuttonGetMbuttonget_mbutton to see how to encode ButtonButtonButtonButtonbuttonbutton.

The purpose of this operator is to manipulate drawing objects in a buffer window. If the coordinates RowRowRowRowrowrow and ColumnColumnColumnColumncolumncolumn are pointing on a drawing object, it is activated and can be moved or changed by sending more events with the send_mouse_down_eventsend_mouse_down_eventSendMouseDownEventSendMouseDownEventSendMouseDownEventsend_mouse_down_event operator. To simplify the interaction with the drawing object, the coordinates RowRowRowRowrowrow and ColumnColumnColumnColumncolumncolumn are given in the image coordinate system. To convert window coordinates into image coordinates, 该算子 convert_coordinates_window_to_imageconvert_coordinates_window_to_imageConvertCoordinatesWindowToImageConvertCoordinatesWindowToImageConvertCoordinatesWindowToImageconvert_coordinates_window_to_image can be used.

If the event could be processed, send_mouse_down_eventsend_mouse_down_eventSendMouseDownEventSendMouseDownEventSendMouseDownEventsend_mouse_down_event returns 'true'"true""true""true""true""true" in ProcessedProcessedProcessedProcessedprocessedprocessed. If no action for the event could be determined (e.g., because there is no drawing object below the mouse position), 'false'"false""false""false""false""false" is returned in ProcessedProcessedProcessedProcessedprocessedprocessed. In this case the caller may determine an action for the event.

该算子s send_mouse_down_eventsend_mouse_down_eventSendMouseDownEventSendMouseDownEventSendMouseDownEventsend_mouse_down_event, send_mouse_up_eventsend_mouse_up_eventSendMouseUpEventSendMouseUpEventSendMouseUpEventsend_mouse_up_event, send_mouse_drag_eventsend_mouse_drag_eventSendMouseDragEventSendMouseDragEventSendMouseDragEventsend_mouse_drag_event and send_mouse_double_click_eventsend_mouse_double_click_eventSendMouseDoubleClickEventSendMouseDoubleClickEventSendMouseDoubleClickEventsend_mouse_double_click_event are the only means to manipulate drawing objects in buffer windows.

注意

send_mouse_down_eventsend_mouse_down_eventSendMouseDownEventSendMouseDownEventSendMouseDownEventsend_mouse_down_event depends on the library libcanvas, which might not be available on embedded systems.

运行信息

• 多线程类型:可重入(与非独占操作符并行运行)。
• 多线程作用域:全局(可以从任何线程调用)。
• 未经并行化处理。

参数表

结果

send_mouse_down_eventsend_mouse_down_eventSendMouseDownEventSendMouseDownEventSendMouseDownEventsend_mouse_down_event 返回值 2 ( H_MSG_TRUE) if the window handle WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle corresponds to a window of valid type, and the event is properly encoded. Otherwise, an exception is raised.

可能的前置算子

open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window

参考其它

send_mouse_up_eventsend_mouse_up_eventSendMouseUpEventSendMouseUpEventSendMouseUpEventsend_mouse_up_event, send_mouse_double_click_eventsend_mouse_double_click_eventSendMouseDoubleClickEventSendMouseDoubleClickEventSendMouseDoubleClickEventsend_mouse_double_click_event, open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window

模块

Foundation

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