/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** GUIX Component */
/** */
/** Text Input Management (Single Line Text Input) */
/** */
/**************************************************************************/
#define GX_SOURCE_CODE
/* Include necessary system files. */
#include "gx_api.h"
#include "gx_context.h"
#include "gx_system.h"
#include "gx_widget.h"
#include "gx_single_line_text_input.h"
#include "gx_utility.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _gx_single_line_text_input_position_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Kenneth Maxwell, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This service positions the text input cursor based on the requested */
/* cursor position. The text input cursor index will be calculated */
/* based on the x value of the pixel pisition. */
/* */
/* INPUT */
/* */
/* text_input Single-line text input */
/* widget control block */
/* pixel_position X value of pixel position */
/* */
/* OUTPUT */
/* */
/* Status Completion status */
/* */
/* CALLS */
/* */
/* _gx_widget_font_get Get widget font */
/* _gx_widget_border_width_get Get the widget border width */
/* _gx_widget_client_get Get client rectangle */
/* _gx_utility_utf8_string_character_get Parse utf8 string to */
/* multi-byte glyph */
/* _gx_system_string_width_get Get the width of a string */
/* _gx_system_dirty_mark Mark a widget area dirty */
/* _gx_system_dirty_partial_add Mark the partial area of a */
/* widget as dirty */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* GUIX Internal Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
/* 09-30-2020 Kenneth Maxwell Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _gx_single_line_text_input_position_get(GX_SINGLE_LINE_TEXT_INPUT *text_input, INT pixel_position)
{
GX_TEXT_INPUT_CURSOR *cursor_ptr;
GX_CHAR *string_buffer;
GX_FONT *gx_font;
GX_RECTANGLE client;
GX_VALUE width;
GX_VALUE cursor_pos;
GX_VALUE x_pos;
GX_VALUE distance;
UINT new_insert_pos;
UINT index;
UINT glyph_len = 1;
GX_STRING utf8_string;
GX_STRING string;
string.gx_string_ptr = text_input -> gx_single_line_text_input_buffer;
string.gx_string_length = text_input -> gx_single_line_text_input_string_size;
cursor_ptr = &text_input -> gx_single_line_text_input_cursor_instance;
string_buffer = text_input -> gx_single_line_text_input_buffer;
_gx_widget_font_get((GX_WIDGET *)text_input, text_input -> gx_prompt_font_id, &gx_font);
_gx_widget_border_width_get((GX_WIDGET *)text_input, &width);
_gx_widget_client_get((GX_WIDGET *)text_input, width, &client);
switch (text_input -> gx_widget_style & GX_STYLE_TEXT_ALIGNMENT_MASK)
{
case GX_STYLE_TEXT_RIGHT:
x_pos = (GX_VALUE)(client.gx_rectangle_right - 1);
break;
case GX_STYLE_TEXT_CENTER:
x_pos = (GX_VALUE)(client.gx_rectangle_left + 1 + ((client.gx_rectangle_right - client.gx_rectangle_left + 1) >> 1));
break;
case GX_STYLE_TEXT_LEFT:
default:
x_pos = (GX_VALUE)(client.gx_rectangle_left + 1);
break;
}
x_pos = (GX_VALUE)(x_pos - text_input -> gx_single_line_text_input_xoffset);
/* Reset mouse down position when it was out of the text show area. */
if (pixel_position < client.gx_rectangle_left + 1)
{
pixel_position = client.gx_rectangle_left + 1;
}
else if (pixel_position > client.gx_rectangle_right + 1)
{
pixel_position = client.gx_rectangle_right - 1;
}
/*Compute the distance from the first character position to the mouse down position. */
if (pixel_position > x_pos)
{
distance = (GX_VALUE)(pixel_position - x_pos);
}
else
{
distance = 0;
}
new_insert_pos = string.gx_string_length;
index = 0;
cursor_pos = 0;
while (string.gx_string_length > 0)
{
#ifdef GX_UTF8_SUPPORT
_gx_utility_utf8_string_character_get(&string, GX_NULL, &glyph_len);
#else
string.gx_string_ptr++;
string.gx_string_length--;
#endif
utf8_string.gx_string_ptr = string_buffer + index;
utf8_string.gx_string_length = glyph_len;
_gx_system_string_width_get_ext(gx_font, &utf8_string, &width);
if ((cursor_pos + width / 2) > distance)
{
new_insert_pos = index;
break;
}
cursor_pos = (GX_VALUE)(cursor_pos + width);
index += glyph_len;
}
/* Update insert position. */
text_input -> gx_single_line_text_input_insert_pos = new_insert_pos;
cursor_pos = (GX_VALUE)(x_pos + cursor_pos);
if (cursor_pos < client.gx_rectangle_left + 1)
{
/* Cursor is beyond widget left, adjust text offset to show cursor. */
cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(client.gx_rectangle_left + 1);
distance = (GX_VALUE)(client.gx_rectangle_left + 1 - cursor_pos);
text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset - distance);
/* Text offset is modified, mark whole text input area dirty. */
_gx_system_dirty_mark((GX_WIDGET *)text_input);
}
else if (cursor_pos > client.gx_rectangle_right - 1)
{
/* Cursor is beyond widget right, adjust text offset to show cursor. */
cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = (GX_VALUE)(client.gx_rectangle_right - 1);
distance = (GX_VALUE)(cursor_pos - (client.gx_rectangle_right - 1));
text_input -> gx_single_line_text_input_xoffset = (GX_VALUE)(text_input -> gx_single_line_text_input_xoffset + distance);
/* Text offset is modified, mark whole text input area dirty. */
_gx_system_dirty_mark((GX_WIDGET *)text_input);
}
else if (cursor_ptr -> gx_text_input_cursor_pos.gx_point_x != cursor_pos)
{
/* For this situation, we only need to mark old and new cursor position dirty. */
client.gx_rectangle_left = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - (cursor_ptr -> gx_text_input_cursor_width >> 1));
client.gx_rectangle_right = (GX_VALUE)(client.gx_rectangle_left + cursor_ptr -> gx_text_input_cursor_width);
_gx_system_dirty_partial_add((GX_WIDGET *)text_input, &client);
cursor_ptr -> gx_text_input_cursor_pos.gx_point_x = cursor_pos;
client.gx_rectangle_left = (GX_VALUE)(cursor_ptr -> gx_text_input_cursor_pos.gx_point_x - (cursor_ptr -> gx_text_input_cursor_width >> 1));
client.gx_rectangle_right = (GX_VALUE)(client.gx_rectangle_left + cursor_ptr -> gx_text_input_cursor_width);
_gx_system_dirty_partial_add((GX_WIDGET *)text_input, &client);
}
return GX_SUCCESS;
}