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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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/** Window Management (Window) */ |
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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_widget.h" |
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#include "gx_window.h" |
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#include "gx_system.h" |
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#include "gx_display.h" |
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#include "gx_canvas.h" |
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#include "gx_utility.h" |
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#include "gx_scrollbar.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_window_client_scroll PORTABLE C */ |
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/* 6.1 */ |
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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 service scrolls the window client area by the specified amount */ |
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/* */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* window Pointer to window */ |
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/* x_scroll Amount to scroll on x-axis */ |
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/* y_scroll Amount to scroll on y-axis */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_widget_scroll main scroll function */ |
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/* _gx_scrollbar_value_set reset scrollbar thumb pos */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application 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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/* */ |
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/**************************************************************************/ |
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UINT _gx_window_client_scroll(GX_WINDOW *window, GX_VALUE x_scroll, GX_VALUE y_scroll) |
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{ |
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GX_SCROLLBAR *scroll; |
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INT scroll_value; |
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/* This function is designed to be called by the application, i.e. not driven |
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by the user operating a scrollbar. However if the window does have scrollbars, |
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we will satisfy the scrolling request by assigning the scroll bar value. |
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*/ |
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scroll = GX_NULL; |
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✓✓ |
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if (x_scroll) |
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{ |
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_gx_window_scrollbar_find(window, (USHORT)GX_TYPE_HORIZONTAL_SCROLL, &scroll); |
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✓✓ |
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if (scroll) |
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{ |
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scroll_value = scroll -> gx_scrollbar_info.gx_scroll_value; |
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scroll_value = scroll_value - x_scroll; |
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/* this function will generate a scroll event, which will cause |
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the parent window to scroll |
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*/ |
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_gx_scrollbar_value_set(scroll, scroll_value); |
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x_scroll = 0; |
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} |
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} |
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✓✓ |
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if (y_scroll) |
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{ |
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_gx_window_scrollbar_find(window, GX_TYPE_VERTICAL_SCROLL, &scroll); |
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✓✓ |
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if (scroll) |
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{ |
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scroll_value = scroll -> gx_scrollbar_info.gx_scroll_value; |
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scroll_value = scroll_value - y_scroll; |
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_gx_scrollbar_value_set(scroll, scroll_value); |
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y_scroll = 0; |
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} |
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} |
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/* If we get to here with non-zero scroll values, the window is being |
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scrolled with no scrollbars. |
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Manually invoke the _gx_window_scroll functions to accomplish |
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the requested scrolling |
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*/ |
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✓✓ |
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if (x_scroll) |
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{ |
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✓✓ |
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if (y_scroll) |
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{ |
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/* If we are scrolling both x and y, we need to do two |
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operations for the block-move to work correctly |
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*/ |
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_gx_window_scroll(window, x_scroll, 0); |
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_gx_window_scroll(window, 0, y_scroll); |
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} |
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else |
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{ |
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/* just scrolling in x */ |
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_gx_window_scroll(window, x_scroll, 0); |
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} |
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} |
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else |
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{ |
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/* just scrolling in y */ |
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_gx_window_scroll(window, 0, y_scroll); |
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} |
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return GX_SUCCESS; |
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} |
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