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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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/** Multi Line Text View Management (Multi Line Text View) */ |
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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_multi_line_text_view.h" |
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#include "gx_window.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_multi_line_text_view_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 function performs the scroll action */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* view Multi-line text view widget */ |
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/* control block */ |
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/* amount_to_scroll Shifting value */ |
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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_window_scrollbar_find Find scrollbar for a window */ |
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/* _gx_scrollbar_reset Reset scrollbar information */ |
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/* _gx_utility_rectangle_resize Offset rectangle by specified */ |
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/* value */ |
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/* _gx_multi_line_text_view_line_cache_update */ |
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/* Update line cache */ |
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/* _gx_widget_block_move Move a block of pixels */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* _gx_multi_line_text_view_event_process */ |
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/* Multi line text view */ |
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/* event process routine */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_multi_line_text_view_scroll(GX_MULTI_LINE_TEXT_VIEW *view, GX_VALUE amount_to_scroll) |
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{ |
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GX_RECTANGLE block; |
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GX_SCROLLBAR *scroll; |
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✓✓ |
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if (!amount_to_scroll) |
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{ |
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return GX_SUCCESS; |
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} |
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/* Calculate the shift value. */ |
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view -> gx_multi_line_text_view_text_scroll_shift += amount_to_scroll; |
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_gx_window_scrollbar_find((GX_WINDOW *)view, GX_TYPE_VERTICAL_SCROLL, &scroll); |
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✓✓ |
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if (scroll) |
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{ |
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_gx_scrollbar_reset((GX_SCROLLBAR *)scroll, GX_NULL); |
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} |
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else |
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{ |
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if (view -> gx_multi_line_text_view_text_total_rows > |
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✓✓ |
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view -> gx_multi_line_text_view_cache_size) |
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{ |
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/* Update line index. */ |
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_gx_multi_line_text_view_line_cache_update(view); |
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} |
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} |
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block = view -> gx_window_client; |
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/* Offset client area by the size of whitespace. */ |
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_gx_utility_rectangle_resize(&block, (GX_VALUE)(-view -> gx_multi_line_text_view_whitespace)); |
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block.gx_rectangle_left = (GX_VALUE)(block.gx_rectangle_left + 1); |
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/* If the text view has a thin (rounded) border with no |
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whitespace between border and text, we cannot use block |
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move to scroll because we will capture pixels from the |
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rounded corner. In that case just use dirty_mark, otherwise |
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use block_move |
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*/ |
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✓✓ |
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if ((view -> gx_widget_style & GX_STYLE_BORDER_THIN) && |
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✓✓ |
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!(view -> gx_widget_style & GX_STYLE_TRANSPARENT) && |
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✓✓ |
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(view -> gx_multi_line_text_view_whitespace == 0)) |
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{ |
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_gx_system_dirty_mark((GX_WIDGET *)view); |
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} |
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else |
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{ |
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_gx_widget_block_move((GX_WIDGET *)view, &block, 0, amount_to_scroll); |
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} |
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return(GX_SUCCESS); |
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} |
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