cell-click

Arguments: grid-widget buttons column-section column-section-border-p column column-num column-border-p x row-section row-section-border-p row row-num row-border-p y &optional trigger-key

This generic function is called when a cell in a grid-widget is clicked. cell-click methods allow the user to initiate arbitrary actions by clicking in particular cells. Often the action is to prompt the user in some way for a new value for the clicked cell; a cell-click method may then call write-cell-value to write the new value into the application's domain data.

If a particular grid cell is to respond to mouse clicks, and the click is not handled by one of the built-in grid-column types such as combo-box-column-mixin, then the application must supply a cell-click method for cells of that row and column type.

grid-widget, row-section, column-section, row, and column are the grid, grid sections, and grid subsections that contain the grid cell that was clicked. row-number and column-number are non-negative integers that indicate the sub-row or sub-column that was clicked when the subsection is replicated (due to having a section-count property that is greater than one); zero indicates the first subsection, and these numbers are always zero for non-replicated subsections.

x and y are the clicked position within the cell, where zero, zero indicates the upper left corner of the cell (inside the borders). The various ...-border-p arguments are true if the click was within *grid-border-mouse-slack* of the right or bottom border of the particular section or subsection.

If trigger-key is true, this indicates that an actual mouse click was not done, but rather that a special key was pressed to emulate a mouse click with the keyboard. In particular, cell-click is called when the user presses the ENTER key or the SPACE bar (unless the user is in a special mode such as typing into an editable-text-column-mixin cell). trigger-key is then the integer code of the key that was pressed, and is therefore the value of either vk-return or vk-space.

A cell-click method could respond differently to each of these keys; for example, a combo-box-column-mixin cell will drop its choice list when SPACE is pressed, as if the user clicked on the cell's arrow, but will start a text edit when ENTER is pressed (assuming that the column's typable property is on), as if the user clicked in the text area of the cell.

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This page was not revised from the 10.0 page.
Created 2019.8.20.