send_mouse_drag_eventT_send_mouse_drag_eventSendMouseDragEventSendMouseDragEventsend_mouse_drag_event (算子)

名称

send_mouse_drag_eventT_send_mouse_drag_eventSendMouseDragEventSendMouseDragEventsend_mouse_drag_event — 向缓冲窗口发送一个事件，表示鼠标拖动事件。

签名

send_mouse_drag_event( : : WindowHandle, Row, Column, Button : Processed)

描述

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

If the event could be processed, send_mouse_drag_eventsend_mouse_drag_eventSendMouseDragEventSendMouseDragEventSendMouseDragEventsend_mouse_drag_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.

The operators 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_drag_eventsend_mouse_drag_eventSendMouseDragEventSendMouseDragEventSendMouseDragEventsend_mouse_drag_event 依赖于 libcanvas 库，该库在嵌入式系统上可能不可用。

执行信息

多线程类型：可重入（与非独占算子并行运行）。
多线程作用域：全局（可从任何线程调用）。
未采用并行化处理。

参数

WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle (输入控制) window → (handle)

Window handle of the buffer window.

RowRowRowRowrowrow (输入控制) point.y → (integer / real)

Row coordinate of the mouse cursor in the image coordinate system.

ColumnColumnColumnColumncolumncolumn (输入控制) point.x → (integer / real)

Column coordinate of the mouse cursor in the image coordinate system.

ButtonButtonButtonButtonbuttonbutton (输入控制) integer → (integer)

Mouse button(s) pressed.

ProcessedProcessedProcessedProcessedprocessedprocessed (输出控制) string → (string)

'true', if HALCON processed the event.

结果

send_mouse_drag_eventsend_mouse_drag_eventSendMouseDragEventSendMouseDragEventSendMouseDragEventsend_mouse_drag_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.否则，将抛出异常。

可能的前趋

open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window

另见

send_mouse_up_eventsend_mouse_up_eventSendMouseUpEventSendMouseUpEventSendMouseUpEventsend_mouse_up_event, send_mouse_down_eventsend_mouse_down_eventSendMouseDownEventSendMouseDownEventSendMouseDownEventsend_mouse_down_event, send_mouse_double_click_eventsend_mouse_double_click_eventSendMouseDoubleClickEventSendMouseDoubleClickEventSendMouseDoubleClickEventsend_mouse_double_click_event, open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window

模块

基础

算子