ref: 2b8fef5c41783bd7a01fab40727d4d353426cb75
dir: /textscreen/txt_spinctrl.c/
// // Copyright(C) 2005-2014 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // #include <ctype.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> #include "doomkeys.h" #include "txt_spinctrl.h" #include "txt_gui.h" #include "txt_io.h" #include "txt_main.h" #include "txt_utf8.h" #include "txt_window.h" // Generate the format string to be used for displaying floats static void FloatFormatString(float step, char *buf, size_t buf_len) { int precision; precision = (int) ceil(-log(step) / log(10)); if (precision > 0) { TXT_snprintf(buf, buf_len, "%%.%if", precision); } else { TXT_StringCopy(buf, "%.1f", buf_len); } } // Number of characters needed to represent a character static unsigned int IntWidth(int val) { char buf[25]; TXT_snprintf(buf, sizeof(buf), "%i", val); return strlen(buf); } static unsigned int FloatWidth(float val, float step) { unsigned int precision; unsigned int result; // Calculate the width of the int value result = IntWidth((int) val); // Add a decimal part if the precision specifies it precision = (unsigned int) ceil(-log(step) / log(10)); if (precision > 0) { result += precision + 1; } return result; } // Returns the minimum width of the input box static unsigned int SpinControlWidth(txt_spincontrol_t *spincontrol) { unsigned int minw, maxw; switch (spincontrol->type) { case TXT_SPINCONTROL_FLOAT: minw = FloatWidth(spincontrol->min.f, spincontrol->step.f); maxw = FloatWidth(spincontrol->max.f, spincontrol->step.f); break; default: case TXT_SPINCONTROL_INT: minw = IntWidth(spincontrol->min.i); maxw = IntWidth(spincontrol->max.i); break; } // Choose the wider of the two values. Add one so that there is always // space for the cursor when editing. if (minw > maxw) { return minw; } else { return maxw; } } static void TXT_SpinControlSizeCalc(TXT_UNCAST_ARG(spincontrol)) { TXT_CAST_ARG(txt_spincontrol_t, spincontrol); spincontrol->widget.w = SpinControlWidth(spincontrol) + 5; spincontrol->widget.h = 1; } static void SetBuffer(txt_spincontrol_t *spincontrol) { char format[25]; switch (spincontrol->type) { case TXT_SPINCONTROL_INT: TXT_snprintf(spincontrol->buffer, spincontrol->buffer_len, "%i", spincontrol->value->i); break; case TXT_SPINCONTROL_FLOAT: FloatFormatString(spincontrol->step.f, format, sizeof(format)); TXT_snprintf(spincontrol->buffer, spincontrol->buffer_len, format, spincontrol->value->f); break; } } static void TXT_SpinControlDrawer(TXT_UNCAST_ARG(spincontrol)) { TXT_CAST_ARG(txt_spincontrol_t, spincontrol); unsigned int i; unsigned int padding; txt_saved_colors_t colors; int bw; int focused; focused = spincontrol->widget.focused; TXT_SaveColors(&colors); TXT_FGColor(TXT_COLOR_BRIGHT_CYAN); TXT_DrawCodePageString("\x1b "); TXT_RestoreColors(&colors); // Choose background color if (focused && spincontrol->editing) { TXT_BGColor(TXT_COLOR_BLACK, 0); } else { TXT_SetWidgetBG(spincontrol); } if (!spincontrol->editing) { SetBuffer(spincontrol); } i = 0; bw = TXT_UTF8_Strlen(spincontrol->buffer); padding = spincontrol->widget.w - bw - 4; while (i < padding) { TXT_DrawString(" "); ++i; } TXT_DrawString(spincontrol->buffer); i += bw; while (i < spincontrol->widget.w - 4) { TXT_DrawString(" "); ++i; } TXT_RestoreColors(&colors); TXT_FGColor(TXT_COLOR_BRIGHT_CYAN); TXT_DrawCodePageString(" \x1a"); } static void TXT_SpinControlDestructor(TXT_UNCAST_ARG(spincontrol)) { TXT_CAST_ARG(txt_spincontrol_t, spincontrol); free(spincontrol->buffer); } static void AddCharacter(txt_spincontrol_t *spincontrol, int key) { if (TXT_UTF8_Strlen(spincontrol->buffer) < SpinControlWidth(spincontrol) && strlen(spincontrol->buffer) < spincontrol->buffer_len - 2) { spincontrol->buffer[strlen(spincontrol->buffer) + 1] = '\0'; spincontrol->buffer[strlen(spincontrol->buffer)] = key; } } static void Backspace(txt_spincontrol_t *spincontrol) { if (TXT_UTF8_Strlen(spincontrol->buffer) > 0) { spincontrol->buffer[strlen(spincontrol->buffer) - 1] = '\0'; } } static void EnforceLimits(txt_spincontrol_t *spincontrol) { switch (spincontrol->type) { case TXT_SPINCONTROL_INT: if (spincontrol->value->i > spincontrol->max.i) spincontrol->value->i = spincontrol->max.i; else if (spincontrol->value->i < spincontrol->min.i) spincontrol->value->i = spincontrol->min.i; break; case TXT_SPINCONTROL_FLOAT: if (spincontrol->value->f > spincontrol->max.f) spincontrol->value->f = spincontrol->max.f; else if (spincontrol->value->f < spincontrol->min.f) spincontrol->value->f = spincontrol->min.f; break; } } static void FinishEditing(txt_spincontrol_t *spincontrol) { switch (spincontrol->type) { case TXT_SPINCONTROL_INT: spincontrol->value->i = atoi(spincontrol->buffer); break; case TXT_SPINCONTROL_FLOAT: spincontrol->value->f = (float) atof(spincontrol->buffer); break; } spincontrol->editing = 0; EnforceLimits(spincontrol); } static int TXT_SpinControlKeyPress(TXT_UNCAST_ARG(spincontrol), int key) { TXT_CAST_ARG(txt_spincontrol_t, spincontrol); // Enter to enter edit mode if (spincontrol->editing) { if (key == KEY_ENTER) { FinishEditing(spincontrol); return 1; } if (key == KEY_ESCAPE) { // Abort without saving value spincontrol->editing = 0; return 1; } if (isdigit(key) || key == '-' || key == '.') { AddCharacter(spincontrol, key); return 1; } if (key == KEY_BACKSPACE) { Backspace(spincontrol); return 1; } } else { // Non-editing mode if (key == KEY_ENTER) { spincontrol->editing = 1; TXT_StringCopy(spincontrol->buffer, "", spincontrol->buffer_len); return 1; } if (key == KEY_LEFTARROW) { switch (spincontrol->type) { case TXT_SPINCONTROL_INT: spincontrol->value->i -= spincontrol->step.i; break; case TXT_SPINCONTROL_FLOAT: spincontrol->value->f -= spincontrol->step.f; break; } EnforceLimits(spincontrol); return 1; } if (key == KEY_RIGHTARROW) { switch (spincontrol->type) { case TXT_SPINCONTROL_INT: spincontrol->value->i += spincontrol->step.i; break; case TXT_SPINCONTROL_FLOAT: spincontrol->value->f += spincontrol->step.f; break; } EnforceLimits(spincontrol); return 1; } } return 0; } static void TXT_SpinControlMousePress(TXT_UNCAST_ARG(spincontrol), int x, int y, int b) { TXT_CAST_ARG(txt_spincontrol_t, spincontrol); unsigned int rel_x; rel_x = x - spincontrol->widget.x; if (rel_x < 2) { TXT_SpinControlKeyPress(spincontrol, KEY_LEFTARROW); } else if (rel_x >= spincontrol->widget.w - 2) { TXT_SpinControlKeyPress(spincontrol, KEY_RIGHTARROW); } } static void TXT_SpinControlFocused(TXT_UNCAST_ARG(spincontrol), int focused) { TXT_CAST_ARG(txt_spincontrol_t, spincontrol); FinishEditing(spincontrol); } txt_widget_class_t txt_spincontrol_class = { TXT_AlwaysSelectable, TXT_SpinControlSizeCalc, TXT_SpinControlDrawer, TXT_SpinControlKeyPress, TXT_SpinControlDestructor, TXT_SpinControlMousePress, NULL, TXT_SpinControlFocused, }; static txt_spincontrol_t *TXT_BaseSpinControl(void) { txt_spincontrol_t *spincontrol; spincontrol = malloc(sizeof(txt_spincontrol_t)); TXT_InitWidget(spincontrol, &txt_spincontrol_class); spincontrol->buffer_len = 25; spincontrol->buffer = malloc(spincontrol->buffer_len); TXT_StringCopy(spincontrol->buffer, "", spincontrol->buffer_len); spincontrol->editing = 0; return spincontrol; } txt_spincontrol_t *TXT_NewSpinControl(int *value, int min, int max) { txt_spincontrol_t *spincontrol; spincontrol = TXT_BaseSpinControl(); spincontrol->type = TXT_SPINCONTROL_INT; spincontrol->value = (void *) value; spincontrol->min.i = min; spincontrol->max.i = max; spincontrol->step.i = 1; return spincontrol; } txt_spincontrol_t *TXT_NewFloatSpinControl(float *value, float min, float max) { txt_spincontrol_t *spincontrol; spincontrol = TXT_BaseSpinControl(); spincontrol->type = TXT_SPINCONTROL_FLOAT; spincontrol->value = (void *) value; spincontrol->min.f = min; spincontrol->max.f = max; spincontrol->step.f = 0.1f; return spincontrol; }