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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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/** Scroll Wheel Management (Generic Scroll Wheel) */ |
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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_scroll_wheel.h" |
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#include "gx_utility.h" |
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#include "gx_system.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_generic_scroll_wheel_scroll PORTABLE C */ |
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/* 6.2.1 */ |
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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 moves up or down the generic scroll wheel. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* wheel Generic scroll wheel control */ |
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/* block */ |
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/* amount Shifting value */ |
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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_scroll_wheel_selected_row_calculate */ |
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/* Calculate the new selected row*/ |
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/* _gx_widget_first_visible_client_child_get */ |
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/* Get the first visible client */ |
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/* _gx_widget_next_visible_client_child_get */ |
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/* Get the next visible client */ |
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/* _gx_widget_scroll_shift Shift a widget */ |
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/* _gx_generic_scroll_wheel_up_wrap Scroll up the scroll wheel */ |
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/* _gx_generic_scroll_wheel_down_wrap Scroll down the scroll wheel */ |
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/* _gx_system_dirty_mark Mark the widget as dirty */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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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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/* 06-02-2021 Ting Zhu Initial Version 6.1.7 */ |
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/* 10-31-2022 Kenneth Maxwell Modified comment(s), */ |
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/* changed return type, */ |
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/* resulting in version 6.2.0 */ |
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/* 03-08-2023 Ting Zhu Modified comment(s), */ |
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/* changed return type, */ |
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/* resulting in version 6.2.1 */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_generic_scroll_wheel_scroll(GX_GENERIC_SCROLL_WHEEL *wheel, GX_VALUE shift) |
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{ |
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GX_WIDGET *child; |
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INT y_shift; |
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INT min_shift; |
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INT max_shift; |
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✓✓ |
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if (!shift) |
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{ |
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return GX_SUCCESS; |
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} |
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✓✓ |
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if (!wheel -> gx_scroll_wheel_wrap_style_check((GX_SCROLL_WHEEL *)wheel)) |
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{ |
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✓✓✓✓
✓✓ |
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if ((shift > 0 && wheel -> gx_scroll_wheel_selected_row == 0) || |
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✓✓ |
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(shift < 0 && wheel -> gx_scroll_wheel_selected_row == wheel -> gx_scroll_wheel_total_rows - 1)) |
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{ |
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y_shift = wheel -> gx_scroll_wheel_selected_yshift + shift; |
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min_shift = (wheel -> gx_scroll_wheel_selected_row - wheel -> gx_scroll_wheel_total_rows + 1) * wheel -> gx_scroll_wheel_row_height; |
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max_shift = (wheel -> gx_scroll_wheel_selected_row * wheel -> gx_scroll_wheel_row_height); |
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✓✓✓✓
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if ((y_shift < min_shift) || (y_shift > max_shift)) |
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{ |
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/* Slow down the speed when scroll outside the valid row range. */ |
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shift = (GX_VALUE)(shift + wheel -> gx_scroll_wheel_shift_error); |
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wheel -> gx_scroll_wheel_shift_error = (GX_BYTE)(shift % 4); |
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shift /= 4; |
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} |
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else |
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{ |
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wheel -> gx_scroll_wheel_shift_error = 0; |
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} |
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} |
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} |
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wheel -> gx_scroll_wheel_selected_yshift = (GX_VALUE)(wheel -> gx_scroll_wheel_selected_yshift + shift); |
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/* Calculate the new selected row. */ |
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_gx_scroll_wheel_selected_row_calculate((GX_SCROLL_WHEEL *)wheel); |
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/* First shift my child widgets. */ |
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child = _gx_widget_first_visible_client_child_get((GX_WIDGET *)wheel); |
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✓✓ |
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while (child) |
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{ |
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_gx_widget_scroll_shift(child, 0, shift, GX_TRUE); |
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✓✓ |
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if (child -> gx_widget_style & GX_STYLE_DRAW_SELECTED) |
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{ |
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child -> gx_widget_style &= (~GX_STYLE_DRAW_SELECTED); |
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} |
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child = _gx_widget_next_visible_client_child_get(child); |
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} |
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/* Next check to see if we need to wrap any child widgets. */ |
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✓✓ |
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if ((wheel -> gx_generic_scroll_wheel_callback != GX_NULL) && |
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✓✓ |
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(wheel -> gx_generic_scroll_wheel_visible_rows < wheel -> gx_scroll_wheel_total_rows) && |
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✓✓✓✓
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((wheel -> gx_generic_scroll_wheel_child_count < wheel -> gx_scroll_wheel_total_rows) || (wheel -> gx_widget_style & GX_STYLE_WRAP))) |
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{ |
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/* This means we have fewer children than list rows, so we |
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need to move and re-use the child widgets. */ |
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✓✓ |
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if (shift < 0) |
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{ |
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_gx_generic_scroll_wheel_up_wrap(wheel); |
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} |
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else |
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{ |
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_gx_generic_scroll_wheel_down_wrap(wheel); |
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} |
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} |
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✓✓ |
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if (wheel -> gx_widget_status & GX_STATUS_VISIBLE) |
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{ |
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_gx_system_dirty_mark((GX_WIDGET *)wheel); |
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} |
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return GX_SUCCESS; |
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} |
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