fileselect.c

一个很好的SDL建立应用程序界面的例子

/*
 * fileselect.c - SDL widget set in C
 *
 * Copyright 2004 by Jeffery L. Post
 * theposts<AT>pacbell<DOT>net
 * Version 0.0.3 - 11/26/04
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include	<stdio.h>
#include	<stdlib.h>
#include <stddef.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include	<string.h>
#include	<ctype.h>
#include <errno.h>

#include	"widgets.h"

#define	MAX_LEN					256
#define	DEFAULT_FS_WIDTH		500
#define	DIRLIST_X_OFFSET		10
#define	DIRLIST_Y_OFFSET		40
#define	FILELIST_Y_OFFSET		40

typedef struct fileList {
	char					*name;
	struct fileList	*next;
} FILELIST;

extern SDL_Surface	*screen;

// Prototypes

void		cancelCB(SDL_Event *event, BUTTON *b);
void		okCB(SDL_Event *event, BUTTON *b);
void		dirEntryCB(SDL_Event *event, BUTTON *b);
void		dirSliderCB(SDL_Event *event, VSLIDER *vs);
void		fileEntryCB(SDL_Event *event, BUTTON *b);
void		fileSliderCB(SDL_Event *event, VSLIDER *vs);
void		adjustFileSlider(int amount);
FILELIST	*getDirectories(void);
FILELIST	*getFiles(char *pattern[]);
void		freeList(FILELIST *list);
int		getListCount(FILELIST *list);
int		ismatch(char *pattern, char *string);
FILELIST	*sortList(FILELIST *list);
FILELIST	*mergeList(FILELIST *a, FILELIST *b);

// Global vars

int		maxWinWidth;
int		maxWinHeight;
char		*wildcardName[] = {
	"*.*",
	NULL
};
char		currentDir[256];
char		*selectedFile = NULL;
FILELIST	*dirList, *fileList;
FILELIST	*list;
LABEL		*lab = NULL;
BUTTON	*btn = NULL;
TEXTBOX	*dirBox = NULL;
VSLIDER	*dirSlider = NULL;
TEXTBOX	*fileBox = NULL;
VSLIDER	*fileSlider = NULL;
BUTTON	*cancelBtn = NULL;
BUTTON	*okBtn = NULL;
int		fileCount, dirCount;
int		fileListXOffset;
int		ListWidth;
int		ListHeight;
int		pageCount;
bool		closeFS;
int		lastActive = 0;
int		dirIndex;
int		dirOffset;
int		fileIndex;
int		fileOffset;
char		currentFileName[256];
char		currentDirName[256];
char		**filePattern;
FILELIST	*listHead, *listTail;
int		listTerminator = -2;
WINDOW	*filesel = NULL;

//
//  Select file widget.
//  template is a wildcard spec, or NULL for all files.
//  path is directory to search, or NULL for current directory.
//
//  Returns a string with the filename selected by the user,
//  NULL if no file was selected, or -1 if main screen exited
//  while in the file selector.
//

char *fileSelect(char *pattern[], char *path)
{
	int			x, w;
	SDL_Event	event;

	closeFS = FALSE;
	dirIndex = -1;
	fileIndex = -1;
	selectedFile = NULL;
	fileCount = dirCount = 0;
	dirOffset = fileOffset = 0;

	if (!pattern)
		filePattern = wildcardName;
	else
		filePattern = pattern;

	getcwd(currentDir, 255);

	if (!filesel)
	{
		maxWinWidth = screen->w;
		maxWinHeight = screen->h;

		if (maxWinWidth > DEFAULT_FS_WIDTH + 20)
			w = DEFAULT_FS_WIDTH;
		else
			w = maxWinWidth - 20;

		filesel = newWindow(10, 10, w, maxWinHeight - 20, black, lgray, white, gray);

		ListHeight = filesel->h - (DIRLIST_Y_OFFSET + 10) - FONT_HEIGHT;
		ListWidth = w / 2 - 40;
		fileListXOffset = w / 2 + 6;

		pageCount = ListHeight / FONT_HEIGHT - 3;

		lab = newLabel(0, 0, black, lgray, white, gray, currentDir);
		lab->w = filesel->w;
		addLabel(filesel, lab, TRUE);

		btn = newButton(DIRLIST_X_OFFSET, DIRLIST_Y_OFFSET - (FONT_HEIGHT + 3), black, lgray, white, gray, " Directories  ");
		addButton(filesel, btn, TRUE);
		btn = newButton(fileListXOffset, FILELIST_Y_OFFSET - (FONT_HEIGHT + 3), black, lgray, white, gray, " Files        ");
		addButton(filesel, btn, TRUE);

		dirBox = newTextBox(DIRLIST_X_OFFSET, DIRLIST_Y_OFFSET, ListWidth, ListHeight, black, white, lgray, gray);
		attachCallBack(dirBox, SDL_MOUSEBUTTONDOWN, (void *) &dirEntryCB);
		fileBox = newTextBox(fileListXOffset, FILELIST_Y_OFFSET, ListWidth, ListHeight, black, white, lgray, gray);
		attachCallBack(fileBox, SDL_MOUSEBUTTONDOWN, (void *) &fileEntryCB);
		addTextBox(filesel, dirBox);
		addTextBox(filesel, fileBox);

		dirSlider = newVSlider(DIRLIST_X_OFFSET + ListWidth + 5, DIRLIST_Y_OFFSET + 1, 15, ListHeight - 2, lgray, lgray, white, gray, 0, 0);
		attachCallBack(dirSlider, SDL_MOUSEBUTTONDOWN, (void *) &dirSliderCB);
		attachCallBack(dirSlider, SDL_MOUSEMOTION, (void *) &dirSliderCB);
		attachCallBack(dirSlider, SLIDER_AUTO_CALLBACK, (void *) &dirSliderCB);
		addVSlider(filesel, dirSlider);

		fileSlider = newVSlider(fileListXOffset + ListWidth + 5, FILELIST_Y_OFFSET + 1, 15, ListHeight - 2, lgray, lgray, white, gray, 0, 0);
		attachCallBack(fileSlider, SDL_MOUSEBUTTONDOWN, (void *) &fileSliderCB);
		attachCallBack(fileSlider, SDL_MOUSEMOTION, (void *) &fileSliderCB);
		attachCallBack(fileSlider, SLIDER_AUTO_CALLBACK, (void *) &fileSliderCB);
		addVSlider(filesel, fileSlider);

		x = DIRLIST_X_OFFSET + ListWidth / 2 - 5 * FONT_WIDTH;
		cancelBtn = newButton(x, maxWinHeight - (FONT_HEIGHT * 3), black, lgray, white, black, " Cancel ");
		attachCallBack(cancelBtn, SDL_MOUSEBUTTONDOWN, (void *) &cancelCB);
		x = fileListXOffset + ListWidth / 2 - 4 * FONT_WIDTH;
		okBtn = newButton(x, maxWinHeight - (FONT_HEIGHT * 3), black, lgray, white, black, "  Ok  ");
		attachCallBack(okBtn, SDL_MOUSEBUTTONDOWN, (void *) &okCB);
		addButton(filesel, cancelBtn, TRUE);
		addButton(filesel, okBtn, TRUE);

		listHead = (FILELIST *) malloc(sizeof(FILELIST));
		listHead->name = NULL;
		listHead->next = NULL;
		listTail = (FILELIST *) malloc(sizeof(FILELIST));
		listTail->name = (char *) &listTerminator;
		listTail->next = listTail;
	}

	fileSlider->position = 0;
	dirSlider->position = 0;
	dirList = getDirectories();

	if (dirList)
	{
		dirCount = getListCount(dirList);
		dirSlider->range = dirCount;

		if (dirCount < 20)
			dirSlider->change = 1;
		else
			dirSlider->change = 20;

		if (dirCount)
		{
			dirList = sortList(dirList);
			list = dirList;

			while (list)
			{
				addText(dirBox, list->name);
				list = list->next;
			}
		}
	}

	fileList = getFiles(filePattern);

	if (fileList)
	{
		fileCount = getListCount(fileList);
		fileSlider->range = fileCount;

		if (fileCount < 20)
			fileSlider->change = 1;
		else
			fileSlider->change = 20;

		if (fileCount)
		{
			fileList = sortList(fileList);
			list = fileList;

			while (list)
			{
				addText(fileBox, list->name);
				list = list->next;
			}
		}
	}

	popUpWidget(filesel);
	updateScreen();

	while (!closeFS)
	{
		SDL_UpdateRect(screen, 0, 0, 0, 0);

		if (!SDL_PollEvent(NULL))
			SDL_WaitEvent(NULL);

		while (SDL_PollEvent(&event))
		{
			switch (event.type)
			{
				case SDL_MOUSEBUTTONDOWN:
					processCB(&event);
					break;

				case SDL_MOUSEBUTTONUP:
					processCB(&event);
					dirSlider->drag = FALSE;
					dirSlider->state = MOUSE_NOT_IN_SLIDER;
					fileSlider->drag = FALSE;
					fileSlider->state = MOUSE_NOT_IN_SLIDER;

					if (!closeFS)
					{
						popUpWidget(filesel);
						updateScreen();
					}
					break;

				case SDL_MOUSEMOTION:
					processCB(&event);
					SDL_UpdateRect(screen, 0, 0, 0, 0);

					while (SDL_PollEvent(&event))
					{
						if (event.type != SDL_MOUSEMOTION)
						{
							if (event.type == SDL_MOUSEBUTTONUP)
							{
								dirSlider->drag = FALSE;
								dirSlider->state = MOUSE_NOT_IN_SLIDER;
								fileSlider->drag = FALSE;
								fileSlider->state = MOUSE_NOT_IN_SLIDER;

								if (!closeFS)
								{
									popUpWidget(filesel);
									updateScreen();
								}
							}

							SDL_PushEvent(&event);
							break;
						}
					}
					break;

				case SDL_KEYDOWN:
					switch (event.key.keysym.sym)
					{
						case SDLK_UP:
							adjustFileSlider(-1);
							break;

						case SDLK_DOWN:
							adjustFileSlider(1);
							break;

						case SDLK_PAGEUP:
							adjustFileSlider(-pageCount);
							break;

						case SDLK_PAGEDOWN:
							adjustFileSlider(pageCount);
							break;

						default:
							break;
					}
					break;

				case TIMER_EVENT:
					if (!closeFS && (topWidget == dirSlider || topWidget == fileSlider))
						processCB(&event);
					break;

				case SDL_QUIT:
					closeFS = TRUE;
					selectedFile = (char *) -1;
					pushDownWidget(filesel);
					break;
			}
		}
	}

	if (fileList)
		freeList(fileList);

	if (dirList)
		freeList(dirList);

	removeTList(dirBox);
	removeTList(fileBox);
	pushDownWidget(filesel);
	return selectedFile;
}

void adjustFileSlider(int amount)
{
	int		pos, pc, loc;
	int		*offset, *count;
	VSLIDER	*vs;
	TEXTBOX	*box;

	if (((WIDGET *) topWidget)->p.type == AlertType)
		return;

	if (!lastActive)
	{
		vs = fileSlider;
		box = fileBox;
		offset = (int *) &fileOffset;
		count = (int *) &fileCount;
	}
	else
	{
		vs = dirSlider;
		box = dirBox;
		offset = (int *) &dirOffset;
		count = (int *) &dirCount;
	}

	loc = *offset + amount;

	if (loc < 0)
		loc = 0;
	else if (loc >= *count)
		loc = *count - 1;

	*offset = loc;
	pc = (loc * 100) / *count;
	pos = (pc * vs->h) / 100;
	vs->position = pos;
	setTListEntry(box, loc);
	showWidget(box);
	showWidget(vs);
}

void cancelCB(SDL_Event *event, BUTTON *b)
{
	if (((WIDGET *) topWidget)->p.type == AlertType)
		return;

	closeFS = TRUE;
	pushDownWidget(filesel);
	selectedFile = NULL;
}

void okCB(SDL_Event *event, BUTTON *b)
{
	if (((WIDGET *) topWidget)->p.type == AlertType)
		return;

	closeFS = TRUE;
	pushDownWidget(filesel);

	if (fileIndex >= 0)
	{
		strcpy(currentFileName, currentDir);
		strcat(currentFileName, "/");
		strcat(currentFileName, getText(fileBox, fileIndex + 1));
		selectedFile = (char *) &currentFileName;
	}
	else
		selectedFile = NULL;
}

void dirSliderCB(SDL_Event *event, VSLIDER *vs)
{
	int	loc;

	if (((WIDGET *) topWidget)->p.type == AlertType)
		return;

	lastActive = 1;
	loc = dirSlider->offset;

	if (loc < 0)
		loc = 0;
	else if (loc >= dirCount)
		loc = dirCount - 1;

	setTListEntry(dirBox, loc);
	dirOffset = loc;
}

void fileSliderCB(SDL_Event *event, VSLIDER *vs)
{
	int	loc;

	if (((WIDGET *) topWidget)->p.type == AlertType)
		return;

	lastActive = 0;
	loc = fileSlider->offset;

	if (loc < 0)
		loc = 0;
	else if (loc >= fileCount)
		loc = fileCount - 1;

	setTListEntry(fileBox, loc);
	fileOffset = loc;
}

void dirEntryCB(SDL_Event *event, BUTTON *b)
{
	int	x, y, xlim, ylim, mx, my, index;

	if (((WIDGET *) topWidget)->p.type == AlertType)
		return;