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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** GUIX Component */ |
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/** */ |
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/** Drop List Management (List) */ |
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/** */ |
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/**************************************************************************/ |
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#define GX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "gx_api.h" |
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#include "gx_system.h" |
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#include "gx_display.h" |
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#include "gx_context.h" |
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#include "gx_widget.h" |
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#include "gx_window.h" |
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#include "gx_utility.h" |
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#include "gx_drop_list.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_drop_list_selected_children_draw PORTABLE C */ |
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/* 6.3.0 */ |
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/* AUTHOR */ |
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/* */ |
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/* Ting Zhu, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function draws the children of the selected item to the drop */ |
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/* list client area with the specified shift values. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* drop_list Pointer to drop list widget */ |
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/* widget Widget to be drawn */ |
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/* xshift Shift value in x coordinate */ |
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/* yshift Shift value in y coordinate */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_utility_rectangle_shift Shift rectangle */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* _gx_drop_list_draw */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 10-31-2023 Ting Zhu Initial Version 6.3.0 */ |
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/* */ |
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/**************************************************************************/ |
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static VOID _gx_drop_list_selected_children_draw(GX_DROP_LIST *drop_list, GX_WIDGET *widget, GX_VALUE xshift, GX_VALUE yshift) |
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{ |
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GX_WIDGET *child; |
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GX_WIDGET *child_child; |
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GX_RECTANGLE old_size; |
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GX_RECTANGLE old_clip; |
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ULONG old_style; |
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/* Save the first child. */ |
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child = widget -> gx_widget_first_child; |
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/* Draw the children. */ |
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✓✓ |
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while (child) |
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{ |
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/* Save the widget size. */ |
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old_size = child -> gx_widget_size; |
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/* Save the widget clip size. */ |
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old_clip = child -> gx_widget_clip; |
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/* Save the widget style. */ |
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old_style = child -> gx_widget_style; |
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/* Update the widget style temporarily. */ |
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✗✓ |
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if (drop_list -> gx_widget_status & GX_STATUS_HAS_FOCUS) |
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{ |
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child -> gx_widget_style |= ~GX_STYLE_DRAW_SELECTED; |
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} |
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else |
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{ |
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child -> gx_widget_style &= ~GX_STYLE_DRAW_SELECTED; |
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} |
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/* Shift the widget size and clip with the specified shift values temporarily. */ |
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_gx_utility_rectangle_shift(&child -> gx_widget_size, xshift, yshift); |
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_gx_utility_rectangle_shift(&child -> gx_widget_clip, xshift, yshift); |
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child_child = child -> gx_widget_first_child; |
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/* Set the first child to NULL temporarily. */ |
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child -> gx_widget_first_child = GX_NULL; |
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/* Draw the widget. */ |
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child -> gx_widget_draw_function(child); |
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✗✓ |
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if (child_child) |
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{ |
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child -> gx_widget_first_child = child_child; |
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_gx_drop_list_selected_children_draw(drop_list, child, xshift, yshift); |
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} |
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/* Recover the widget properties. */ |
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child -> gx_widget_size = old_size; |
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child -> gx_widget_clip = old_clip; |
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child -> gx_widget_style = old_style; |
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child = child -> gx_widget_next; |
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} |
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} |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_drop_list_draw PORTABLE C */ |
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/* 6.3.0 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function draws the specified widget. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* drop_list Pointer to drop list widget */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_drop_list_background_draw Draw the widget background */ |
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/* _gx_widget_children_draw Draw children widgets */ |
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/* _gx_vertical_list_selected_widget_get Get selected child item of */ |
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/* popup list */ |
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/* _gx_widget_client_get Find the client area of a */ |
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/* widget */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* GUIX Internal Code */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
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/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* 10-31-2023 Ting Zhu Modified comment(s), */ |
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/* improved drawing of the */ |
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/* selected item, */ |
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/* resulting in version 6.3.0 */ |
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/* */ |
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/**************************************************************************/ |
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VOID _gx_drop_list_draw(GX_DROP_LIST *drop_list) |
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{ |
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GX_RECTANGLE client; |
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GX_WIDGET *selected; |
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GX_VALUE xshift; |
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GX_VALUE yshift; |
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INT selected_index; |
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GX_VERTICAL_LIST *list = &drop_list -> gx_drop_list_popup.gx_popup_list_list; |
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GX_RECTANGLE size; |
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GX_RECTANGLE clip; |
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ULONG style; |
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GX_WIDGET *child = GX_NULL; |
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GX_BOOL reuse_list_item = GX_FALSE; |
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/* Draw the background. */ |
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_gx_drop_list_background_draw(drop_list); |
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/* Pick the selected item. */ |
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_gx_vertical_list_selected_widget_get(list, &selected); |
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✓✓✓✓
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if (!selected && list -> gx_vertical_list_callback) |
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{ |
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/* If not be able to retrieve the selected widget, its possible that the selcted item |
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has been reused for displaying the other list items during the scrolling. |
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In this case, try to get the selected index first, then reuse the list child to draw the selected item. */ |
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/* Get the selected index. */ |
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_gx_vertical_list_selected_index_get(list, &selected_index); |
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✓✓✓✗
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if((selected_index >= 0) && (selected_index < list -> gx_vertical_list_total_rows)) |
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{ |
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/* Make the first list child as the selected widget temporarily. */ |
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selected = _gx_widget_first_client_child_get((GX_WIDGET *)list); |
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/* Call the list callback function to create the selected widget. */ |
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list -> gx_vertical_list_callback(list, selected, selected_index); |
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reuse_list_item = GX_TRUE; |
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} |
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} |
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✓✓ |
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if (selected) |
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{ |
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_gx_widget_client_get((GX_WIDGET *)drop_list, -1, &client); |
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size = selected -> gx_widget_size; |
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clip = selected -> gx_widget_clip; |
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✓✓ |
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if (selected -> gx_widget_first_child) |
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{ |
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child = selected -> gx_widget_first_child; |
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selected -> gx_widget_first_child = GX_NULL; |
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/* Calculate the distance from the selected widget to the client area. */ |
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xshift = (GX_VALUE)(client.gx_rectangle_left - size.gx_rectangle_left); |
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yshift = (GX_VALUE)((client.gx_rectangle_bottom + client.gx_rectangle_top - size.gx_rectangle_bottom - size.gx_rectangle_top) >> 1); |
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} |
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selected -> gx_widget_size = client; |
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selected -> gx_widget_clip = client; |
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/* Save the widget style. */ |
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style = selected -> gx_widget_style; |
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/* Update the widget style temporarily. */ |
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✓✓ |
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if (drop_list -> gx_widget_status & GX_STATUS_HAS_FOCUS) |
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{ |
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selected -> gx_widget_style |= ~GX_STYLE_DRAW_SELECTED; |
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} |
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else |
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{ |
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selected -> gx_widget_style &= ~GX_STYLE_DRAW_SELECTED; |
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} |
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selected -> gx_widget_draw_function(selected); |
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✓✓ |
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if (child) |
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{ |
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selected -> gx_widget_first_child = child; |
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/* Draw the selected widget into my client area: */ |
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_gx_drop_list_selected_children_draw(drop_list, selected, xshift, yshift); |
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} |
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selected -> gx_widget_size = size; |
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selected -> gx_widget_clip = clip; |
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selected -> gx_widget_style = style; |
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} |
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✓✓ |
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if (reuse_list_item) |
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{ |
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/* Call the list callback funtion to create the widget with its original index. */ |
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list -> gx_vertical_list_callback(list, selected, list -> gx_vertical_list_top_index); |
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} |
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/* Draw the children. */ |
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_gx_widget_children_draw((GX_WIDGET *)drop_list); |
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} |
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