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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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/** Scroll Wheel Management (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_scroll_wheel.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_scroll_wheel_selected_row_calculate PORTABLE C */ |
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/* 6.1.7 */ |
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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 calculates the current selected row for scroll wheel */ |
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/* widget. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* wheel Scroll wheel control block */ |
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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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/* None */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* _gx_text_scroll_wheel_scroll */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_scroll_wheel_selected_row_calculate(GX_SCROLL_WHEEL *wheel) |
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{ |
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INT yshift; |
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INT selected_row; |
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GX_VALUE half_row_height = (wheel -> gx_scroll_wheel_row_height >> 1); |
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yshift = wheel -> gx_scroll_wheel_selected_yshift; |
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selected_row = wheel -> gx_scroll_wheel_selected_row; |
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✓✓ |
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if (wheel -> gx_scroll_wheel_wrap_style_check(wheel)) |
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{ |
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✓✓ |
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while (yshift > half_row_height) |
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{ |
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/* Scroll Down. */ |
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yshift -= wheel -> gx_scroll_wheel_row_height; |
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selected_row--; |
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} |
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✓✓ |
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while (yshift < -half_row_height) |
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{ |
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/* Scroll Up. */ |
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yshift += wheel -> gx_scroll_wheel_row_height; |
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selected_row++; |
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} |
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✓✓ |
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while (selected_row > wheel -> gx_scroll_wheel_total_rows - 1) |
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{ |
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selected_row -= wheel -> gx_scroll_wheel_total_rows; |
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} |
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✓✓ |
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while (selected_row < 0) |
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{ |
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selected_row += wheel -> gx_scroll_wheel_total_rows; |
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} |
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} |
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else |
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{ |
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✓✓✓✓
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while ((yshift > half_row_height) && |
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(selected_row > 0)) |
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{ |
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/* Scroll Down. */ |
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yshift -= wheel -> gx_scroll_wheel_row_height; |
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selected_row--; |
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} |
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✓✓ |
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while ((yshift < -half_row_height) && |
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✓✓ |
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(selected_row < wheel -> gx_scroll_wheel_total_rows - 1)) |
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{ |
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/* Scroll Up. */ |
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yshift += wheel -> gx_scroll_wheel_row_height; |
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selected_row++; |
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} |
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} |
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wheel -> gx_scroll_wheel_selected_row = selected_row; |
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wheel -> gx_scroll_wheel_selected_yshift = (GX_VALUE)yshift; |
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return GX_SUCCESS; |
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} |
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