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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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/** Prompt Management (Slider) */ |
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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_slider.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_slider_value_calculate 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 calculates the slider value. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* slider Slider widget control block */ |
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/* info Pointer to slider info */ |
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/* new_position New slider position */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_slider_travel_get Get the slider travel */ |
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/* _gx_slider_value_set Set the slider value */ |
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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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UINT _gx_slider_value_calculate(GX_SLIDER *slider, GX_SLIDER_INFO *info, INT new_position) |
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{ |
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INT newval; |
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INT mintravel; |
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INT maxtravel; |
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/* get travel limits */ |
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_gx_slider_travel_get(slider, info, &mintravel, &maxtravel); |
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/* make sure we don't allow travel too far */ |
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✓✓ |
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if (new_position < mintravel) |
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{ |
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new_position = mintravel; |
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} |
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else |
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{ |
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✓✓ |
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if (new_position > maxtravel) |
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{ |
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new_position = maxtravel; |
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} |
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} |
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/* use position to calculate new value */ |
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✓✓ |
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if (maxtravel > mintravel) |
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{ |
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/* do linear interpolation using input position to |
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determine new slider value |
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*/ |
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/* get distance from starting point */ |
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✓✓ |
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if (slider -> gx_widget_style & GX_STYLE_SLIDER_VERTICAL) |
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{ |
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newval = maxtravel - new_position; |
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} |
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else |
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{ |
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newval = new_position - mintravel; |
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} |
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newval = GX_FIXED_VAL_MAKE(newval); |
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/* multiply by value range */ |
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newval *= info -> gx_slider_info_max_val - info -> gx_slider_info_min_val; |
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/* divide by travel range */ |
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newval /= (maxtravel - mintravel); |
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newval = GX_FIXED_VAL_RND(newval); |
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/* offset by min value */ |
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newval += info -> gx_slider_info_min_val; |
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/* has the value changed? */ |
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✓✓ |
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if (newval != info -> gx_slider_info_current_val) |
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{ |
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/* yes, re-assign value which will move the needle */ |
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_gx_slider_value_set(slider, info, newval); |
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} |
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} |
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return(GX_SUCCESS); |
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} |
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