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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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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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/** Scrollbar Management (Scrollbar) */ |
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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_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_scrollbar_thumb_shift_limit 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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/* Limit the travel of a scrollbar thumb button so that it cannot */ |
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/* shift outside parent's limits. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* thumb Thumb button control block */ |
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/* shift Requested shift amount */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Shift Allowed shift amount */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* None */ |
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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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/**************************************************************************/ |
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INT _gx_scroll_thumb_shift_limit(GX_SCROLL_THUMB *thumb, INT shift) |
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{ |
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INT minlimit; |
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INT maxlimit; |
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INT shiftpos; |
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GX_WIDGET *parent; |
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GX_SCROLLBAR *bar; |
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GX_RECTANGLE parentsize; |
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ULONG style; |
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/* pick up thumb style */ |
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style = thumb -> gx_widget_style; |
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/* pick up parent scrollbar */ |
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parent = thumb -> gx_widget_parent; |
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parentsize = parent -> gx_widget_size; |
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bar = (GX_SCROLLBAR *)parent; |
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✓✓ |
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if (style & GX_SCROLLBAR_VERTICAL) |
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{ |
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minlimit = parentsize.gx_rectangle_top + bar -> gx_scrollbar_appearance.gx_scroll_thumb_travel_min; |
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maxlimit = parentsize.gx_rectangle_bottom - bar -> gx_scrollbar_appearance.gx_scroll_thumb_travel_max; |
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✓✓ |
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if (shift > 0) |
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{ |
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/* shifting down, don't allow down too far */ |
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shiftpos = thumb -> gx_widget_size.gx_rectangle_bottom + shift; |
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✓✓ |
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if (shiftpos > maxlimit) |
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{ |
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shift = maxlimit - thumb -> gx_widget_size.gx_rectangle_bottom; |
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} |
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} |
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else |
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{ |
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/* shifting up, don't allow shift up too far */ |
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shiftpos = thumb -> gx_widget_size.gx_rectangle_top + shift; |
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✓✓ |
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if (shiftpos < minlimit) |
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{ |
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shift = minlimit - thumb -> gx_widget_size.gx_rectangle_top; |
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} |
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} |
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} |
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else |
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{ |
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minlimit = parentsize.gx_rectangle_left + bar -> gx_scrollbar_appearance.gx_scroll_thumb_travel_min; |
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maxlimit = parentsize.gx_rectangle_right - bar -> gx_scrollbar_appearance.gx_scroll_thumb_travel_max; |
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✓✓ |
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if (shift > 0) |
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{ |
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/* shifting right, don't allow down too over */ |
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shiftpos = thumb -> gx_widget_size.gx_rectangle_right + shift; |
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✓✓ |
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if (shiftpos > maxlimit) |
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{ |
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shift = maxlimit - thumb -> gx_widget_size.gx_rectangle_right; |
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} |
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} |
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else |
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{ |
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/* shifting left, don't allow shift up too far */ |
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shiftpos = thumb -> gx_widget_size.gx_rectangle_left + shift; |
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✓✓ |
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if (shiftpos < minlimit) |
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{ |
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shift = minlimit - thumb -> gx_widget_size.gx_rectangle_left; |
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} |
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} |
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} |
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return shift; |
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} |
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