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ui_tools.c
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/*
* Copyright (c) 2021 Justin Meiners
*
* 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, version 2.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ui.h"
#include <Xm/List.h>
#include <Xm/ToggleB.h>
#include <Xm/ToggleBG.h>
#include <X11/xpm.h>
// http://manpages.ubuntu.com/manpages/precise/man1/pixmap.1.html
// https://www.motif.ics.com/forum/location-xpm-motif-21
#include "icons/icon_select_rectangle.xpm"
#include "icons/icon_eraser.xpm"
#include "icons/icon_paint_bucket.xpm"
#include "icons/icon_eye_dropper.xpm"
#include "icons/icon_magnifier.xpm"
#include "icons/icon_pencil.xpm"
#include "icons/icon_paint_brush.xpm"
#include "icons/icon_line.xpm"
#include "icons/icon_rectangle.xpm"
#include "icons/icon_ellipse.xpm"
#include "icons/icon_airbrush.xpm"
#include "icons/icon_text.xpm"
#include "icons/icon_polygon.xpm"
#include "icons/icon_lasso.xpm"
typedef enum
{
OPTION_NONE = 0,
OPTION_LINE_WIDTH,
OPTION_BRUSH_WIDTH,
OPTION_ERASER_WIDTH,
OPTION_SHAPE_FLAGS,
OPTION_ZOOM_LEVEL,
OPTION_SELECT_MODE,
OPTION_BUCKET_MODE,
OPTION_COUNT,
} ToolOption;
static
void set_option_(PaintContext* ctx, ToolOption option, int value)
{
switch (option)
{
case OPTION_LINE_WIDTH:
ctx->line_width = value;
break;
case OPTION_BRUSH_WIDTH:
ctx->brush_width = value;
break;
case OPTION_ERASER_WIDTH:
ctx->eraser_width = value;
break;
case OPTION_SHAPE_FLAGS:
ctx->shape_flags = (ShapeFlags)value;
break;
case OPTION_ZOOM_LEVEL:
ctx->zoom_level = value;
break;
case OPTION_SELECT_MODE:
ctx->select_mode = (SelectMode)value;
break;
case OPTION_BUCKET_MODE:
ctx->bucket_mode = (BucketMode)value;
break;
}
}
static
int get_option_(const PaintContext* ctx, ToolOption option)
{
switch (option)
{
case OPTION_LINE_WIDTH:
return ctx->line_width;
case OPTION_BRUSH_WIDTH:
return ctx->brush_width;
case OPTION_ERASER_WIDTH:
return ctx->eraser_width;
case OPTION_SHAPE_FLAGS:
return (int)ctx->shape_flags;
case OPTION_ZOOM_LEVEL:
return ctx->zoom_level;
case OPTION_SELECT_MODE:
return (int)ctx->select_mode;
case OPTION_BUCKET_MODE:
return (int)ctx->bucket_mode;
}
return -1;
}
Widget g_tool_radio = NULL;
typedef struct
{
const char* text;
int value;
} ToolOptionInfo;
ToolOptionInfo g_line_options[] = {
<
8000
div>
{ "1 px", 1 },
{ "2 px", 2 },
{ "4 px", 4 },
{ "6 px", 6 },
{ "8 px", 8 },
{ "16 px", 16 },
};
enum {
LINE_OPTION_COUNT = sizeof(g_line_options) / sizeof(ToolOptionInfo)
};
ToolOptionInfo g_brush_options[] = {
{ "1 px", 1 },
{ "4 px", 4 },
{ "6 px", 6 },
{ "12 px", 12 },
{ "16 px", 16 },
{ "32 px", 32 },
};
enum {
BRUSH_OPTION_COUNT = sizeof(g_brush_options) / sizeof(ToolOptionInfo)
};
ToolOptionInfo g_eraser_options[] = {
{ "4 px", 4 },
{ "8 px", 8 },
{ "16 px", 16 },
{ "32 px", 32 },
{ "64 px", 64 },
{ "96 px", 96 },
};
enum {
ERASER_OPTION_COUNT = sizeof(g_eraser_options) / sizeof(ToolOptionInfo)
};
ToolOptionInfo g_shape_options[] = {
{ "stroke", SHAPE_STROKE },
{ "fill", SHAPE_FILL },
{ "fill & stroke", SHAPE_STROKE | SHAPE_FILL },
};
enum {
SHAPE_OPTION_COUNT = sizeof(g_shape_options) / sizeof(ToolOptionInfo)
};
ToolOptionInfo g_zoom_options[] = {
{ "1x", 1 },
{ "2x", 2 },
{ "4x", 4 },
{ "8x", 8 },
{ "16x", 16 },
{ "32x", 32 },
};
enum {
ZOOM_OPTION_COUNT = sizeof(g_zoom_options) / sizeof(ToolOptionInfo)
};
ToolOptionInfo g_select_options[] = {
{ "no background", SELECT_IGNORE_BG },
{ "everything", SELECT_KEEP_BG }
};
enum {
SELECT_OPTION_COUNT = sizeof(g_select_options) / sizeof(ToolOptionInfo)
};
ToolOptionInfo g_bucket_options[] = {
{ "neighbors", BUCKET_CONTIGUOUS },
{ "everywhere", BUCKET_GLOBAL }
};
enum {
BUCKET_OPTION_COUNT = sizeof(g_bucket_options) / sizeof(ToolOptionInfo)
};
typedef struct
{
PaintTool tool;
ToolOption option_set;
char* text;
char** pixmap;
char* help;
} ToolInfo;
static const ToolOptionInfo* get_options_(ToolOption option_set, int* out_count)
{
switch (option_set)
{
case OPTION_LINE_WIDTH:
*out_count = LINE_OPTION_COUNT;
return g_line_options;
case OPTION_BRUSH_WIDTH:
*out_count = BRUSH_OPTION_COUNT;
return g_brush_options;
case OPTION_ERASER_WIDTH:
*out_count = ERASER_OPTION_COUNT;
return g_eraser_options;
case OPTION_SHAPE_FLAGS:
*out_count = SHAPE_OPTION_COUNT;
return g_shape_options;
case OPTION_ZOOM_LEVEL:
*out_count = ZOOM_OPTION_COUNT;
return g_zoom_options;
case OPTION_BUCKET_MODE:
*out_count = BUCKET_OPTION_COUNT;
return g_bucket_options;
case OPTION_SELECT_MODE:
*out_count = SELECT_OPTION_COUNT;
return g_select_options;
}
*out_count = 0;
return NULL;
}
ToolInfo g_tools[] = {
{
TOOL_BRUSH,
OPTION_BRUSH_WIDTH,
"Paint Brush",
icon_paint_brush,
"Click and drag to draw brush strokes."
},
{
TOOL_PENCIL,
OPTION_LINE_WIDTH,
"Pencil",
icon_pencil,
"Click and drag to draw free-form lines."
},
{
TOOL_ERASER,
OPTION_ERASER_WIDTH,
"Eraser",
icon_eraser,
"Click and drag to erase portions of the image with the background color."
},
{
TOOL_EYE_DROPPER,
OPTION_NONE,
"Eyedropper",
icon_eye_dropper,
"Select foreground (left-click) or background (right-click) color from a pixel in the image."
},
{
TOOL_SPRAY_CAN,
OPTION_BRUSH_WIDTH,
"Airbrush",
icon_airbrush,
"Click and drag to spray with the airbrush."
},
{
TOOL_PAINT_BUCKET,
OPTION_BUCKET_MODE,
"Paint bucket",
icon_paint_bucket,
"Click to fill a connected region (neighbors) or to replace a color in the entire image (everywhere)."
},
{
TOOL_SELECT_RECTANGLE,
OPTION_SELECT_MODE,
"Select rectangle",
icon_select_rectangle,
"Click and drag to select a rectangular region. The selection can be moved with click and drag."
},
{
TOOL_MAGNIFIER,
OPTION_ZOOM_LEVEL,
"Magnifier",
icon_magnifier,
"Left-click to magnify. Right-click to reset. Hold left-click to see preview of viewport."
},
{
TOOL_TEXT,
OPTION_NONE,
"Test",
icon_text,
"Click and drag to create a textbox. Write text and configure appearence in the text window."
},
{
TOOL_LINE,
OPTION_LINE_WIDTH,
"Line",
icon_line,
"Click and drag a straight line from start to end. Hold shift to snap to angles."
},
{
TOOL_RECTANGLE,
OPTION_SHAPE_FLAGS,
"Rectangle",
icon_rectangle,
"Click and drag to draw a rectangle from start to end. Hold shift to snap to square."
},
{
TOOL_ELLIPSE,
OPTION_SHAPE_FLAGS,
"Ellipse",
icon_ellipse,
"Click and drag to draw an ellipse from start to end. Hold shift to snap to circle."
},
{
TOOL_POLYGON,
OPTION_SHAPE_FLAGS,
"Polygon",
icon_polygon,
"Click and drag to add a new segment to the polygon. Hold shift to snap to angles."
},
{
TOOL_SELECT_POLYGON,
OPTION_SELECT_MODE,
"Lasso select",
icon_lasso,
"Click and drag to outline a selection area. The selection can be moved with click and drag."
},
};
const int g_tools_count = sizeof(g_tools) / sizeof(ToolInfo);
static void update_tool_options_(Widget option_list, ToolOption option_set)
{
PaintContext* ctx = &g_paint_ctx;
int n = 0;
Arg args[UI_ARGS_MAX];
int count;
const ToolOptionInfo* set = get_options_(option_set, &count);
int selected_value = get_option_(ctx, option_set);
int selected_item = -1;
XmStringTable options = XtMalloc(count * sizeof(XmString));
for (int i = 0; i < count; ++i)
{
if (set[i].value == selected_value)
selected_item = i;
options[i] = XmStringCreateLocalized(set[i].text);
}
n = 0;
XtSetArg(args[n], XmNitems, options); n++;
XtSetArg(args[n], XmNvisibleItemCount, count); n++;
XtSetArg(args[n], XmNitemCount, count); n++;
XtSetValues(option_list, args, n);
if (selected_item != -1)
XmListSelectPos(option_list, selected_item + 1, 0);
for (int i = 0; i < count; ++i) XmStringFree(options[i]);
XtFree(options);
}
static void change_tool_(Widget widget, XtPointer client_data, XtPointer call_data)
{
// todo: double call
PaintContext* ctx = &g_paint_ctx;
size_t selection = (size_t)client_data;
XmToggleButtonCallbackStruct* cbs = (XmToggleButtonCallbackStruct*)call_data;
if (cbs->set != XmSET) return;
const ToolInfo* tool = g_tools + selection;
paint_set_tool(ctx, tool->tool);
if (!paint_is_editing_text(&g_paint_ctx)) {
ui_disable_editing_text();
}
Widget options_list = XtNameToWidget(g_main_w, "*tool_options");
update_tool_options_(options_list, tool->option_set);
Widget command_message = XtNameToWidget(g_main_w, "*command_message");
XmTextFieldSetString(command_message, tool->help);
ui_refresh_drawing(0);
}
static void change_tool_option_(Widget widget, XtPointer client_data, XtPointer call_data)
{
PaintContext* ctx = &g_paint_ctx;
XmListCallbackStruct *cbs = (XmListCallbackStruct *) call_data;
size_t option_index = cbs->item_position - 1;
// linear search for which tool
int selection = 0;
while (selection < g_tools_count)
{
if (g_tools[selection].tool == ctx->tool) break;
++selection;
}
assert(selection >= 0 && selection < TOOL_COUNT);
const ToolInfo* tool = g_tools + selection;
int count;
const ToolOptionInfo* set = get_options_(tool->option_set, &count);
if (set)
{
int value = set[option_index].value;
if (DEBUG_LOG)
{
printf("changing setting: %d %d %d\n", tool->option_set, option_index, value);
}
set_option_(ctx, tool->option_set, value);
}
}
void ui_refresh_tool(void)
{
PaintTool tool = g_paint_ctx.tool;
if (!paint_is_editing_text(&g_paint_ctx)) {
ui_disable_editing_text();
}
char name[UI_NAME_MAX];
snprintf(name, UI_NAME_MAX, "tool_%d", tool);
Widget widget = XtNameToWidget(g_tool_radio, name);
if (widget)
{
XmToggleButtonSetState(widget, 1, 1);
}
}
Widget ui_setup_tool_area(Widget parent)
{
int n = 0;
Arg args[UI_ARGS_MAX];
XtSetArg(args[n], XmNorientation, XmVERTICAL); ++n;
XtSetArg(args[n], XmNpaneMaximum, 240); ++n;
XtSetArg(args[n], XmNshowSash, 0); ++n;
Widget tool_option_column = XmCreateRowColumn(parent, "tool_option_column", args, n);
Pixel fg, bg;
XtVaGetValues (tool_option_column, XmNforeground, &fg, XmNbackground, &bg, NULL);
n = 0;
XtSetArg(args[n], XmNnumColumns, 2); ++n;
XtSetArg(args[n], XmNpacking, XmPACK_COLUMN);
Widget radio_box = XtVaCreateWidget(
"tool_column",
xmRowColumnWidgetClass,
tool_option_column,
XmNspacing, 0,
XmNpacking, XmPACK_COLUMN,
XmNnumColumns, 2,
XmNisHomogeneous, 1,
//XmNbackground, WhitePixel(XtDisplay(parent), 0),
XmNradioBehavior, 1,
NULL);
char name[UI_NAME_MAX];
for (size_t i = 0; i < g_tools_count; ++i)
{
snprintf(name, UI_NAME_MAX, "tool_%d", g_tools[i].tool);
n = 0;
if (g_tools[i].pixmap)
{
XtSetArg(args[n], XmNlabelType, XmPIXMAP); ++n;
Pixmap p;
XpmCreatePixmapFromData(XtDisplay(parent), RootWindowOfScreen(XtScreen(parent)), g_tools[i].pixmap, &p, NULL, NULL);
XtSetArg(args[n], XmNlabelPixmap, p); ++n;
}
else
{
XmString text = XmStringCreateLocalized(g_tools[i].text);
XtSetArg(args[n], XmNlabelString, text); ++n;
XmStringFree(text);
}
XtSetArg(args[n], XmNvisibleWhenOff, 0); ++n;
XtSetArg(args[n], XmNindicatorOn, XmINDICATOR_CHECK); ++n;
XtSetArg(args[n], XmNshadowThickness, 2); ++n;
XtSetArg(args[n], XmNbackground, WhitePixel(XtDisplay(parent), 0)); ++n;
XtSetArg(args[n], XmNhighlightThickness, 0); ++n;
Widget added = XtCreateManagedWidget(
name,
xmToggleButtonWidgetClass,
radio_box,
args,
n);
XtAddCallback(added, XmNvalueChangedCallback, change_tool_, (XtPointer)i);
}
g_tool_radio = radio_box;
XtManageChild(radio_box);
n = 0;
XtSetArg(args[n], XmNselectionPolicy, XmSINGLE_SELECT); n++;
// horizontal spacing.
// This was causing the option list to sometimes have an incorrect vertical size.
XtSetArg(args[n], XmNlistSizePolicy, XmCONSTANT); n++;
Widget options_list = XmCreateList(tool_option_column, "tool_options", args, n);
// called by mouse
XtAddCallback(options_list, XmNsingleSelectionCallback, change_tool_option_, NULL);
// called by arrows + enter on keyboard
XtAddCallback(options_list, XmNdefaultActionCallback, change_tool_option_, NULL);
update_tool_options_(options_list, OPTION_LINE_WIDTH);
XtManageChild(options_list);
XtManageChild(tool_option_column);
return tool_option_column;
}