ui/motif/text.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2014 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "text.h"
#include "container.h"

#include <cx/string.h>


/* ------------------------------ Text Field ------------------------------ */

static UIWIDGET create_textfield(UiObject *obj, UiTextFieldArgs args, int frameless, int password) {
    Arg xargs[16];
    int n = 0;
    
    if(frameless) {
        XtSetArg(xargs[n], XmNshadowThickness, 0);
        n++;
    }
    if(password) {
        // TODO
    }
    
    UiContainerPrivate *ctn = ui_obj_container(obj);
    UI_APPLY_LAYOUT(ctn->layout, args);
    
    Widget parent = ctn->prepare(ctn, xargs, &n);
    char *name = args.name ? (char*)args.name : "textfield";
    Widget textfield = XmCreateTextField(parent, name, xargs, n);
    XtManageChild(textfield);
    
    ui_set_widget_groups(obj->ctx, textfield, args.groups);
    
    UiVar* var = uic_widget_var(obj->ctx, obj->ctx, args.value, args.varname, UI_VAR_STRING);
    if(var) {
        UiString *value = (UiString*)var->value;
        value->obj = textfield;
        value->get = ui_textfield_get;
        value->set = ui_textfield_set;
        
        if(value->value.ptr) {
            ui_textfield_set(value, value->value.ptr);
        }
    }
    
    return textfield;
}

UIWIDGET ui_textfield_create(UiObject *obj, UiTextFieldArgs args) {
    return create_textfield(obj, args, FALSE, FALSE);
}

UIWIDGET ui_frameless_textfield_create(UiObject* obj, UiTextFieldArgs args) {
    return create_textfield(obj, args, TRUE, FALSE);
}

UIWIDGET ui_passwordfield_create(UiObject* obj, UiTextFieldArgs args) {
    return create_textfield(obj, args, FALSE, FALSE);
}

char* ui_textfield_get(UiString *str) {
    str->value.free(str->value.ptr);
    char *value = XmTextFieldGetString(str->obj);
    str->value.ptr = value;
    str->value.free = (ui_freefunc)XtFree;
    return value;
}

void ui_textfield_set(UiString *str, const char *value) {
    XmTextFieldSetString(str->obj, (void*)value);
    str->value.ptr = NULL;
    str->value.free(str->value.ptr);
}


/* -------------------- path bar -------------------- */

#define XNECreateText(parent,name,args,count)   XmCreateTextField(parent,name,args,count)
#define XNETextSetString(widget,value)          XmTextFieldSetString(widget,value)
#define XNETextGetString(widget)                XmTextFieldGetString(widget)
#define XNETextGetLastPosition(widget)          XmTextFieldGetLastPosition(widget)  
#define XNETextSetInsertionPosition(widget, i)  XmTextFieldSetInsertionPosition(widget, i)  
#define XNETextSetSelection(w, f, l, t)         XmTextFieldSetSelection(w, f, l, t)

typedef void(*updatedir_callback)(void*,char*);

typedef struct PathBar {  
    Widget widget;
    Widget textfield;
    
    Widget focus_widget;
    
    Widget left;
    Widget right;
    Dimension lw;
    Dimension rw;
    
    int shift;
    
    Widget *pathSegments;
    size_t numSegments;
    size_t segmentAlloc;
    
    char *path;
    int selection;
    Boolean input;
    
    int focus;
    
    updatedir_callback updateDir;
    void *updateDirData;
} PathBar;

void PathBarSetPath(PathBar *bar, const char *path);

void pathbar_resize(Widget w, PathBar *p, XtPointer d)
{
    Dimension width, height;
    XtVaGetValues(w, XmNwidth, &width, XmNheight, &height, NULL);
    
    Dimension *segW = (void*)XtCalloc(p->numSegments, sizeof(Dimension));
    
    Dimension maxHeight = 0;
    
    /* get width/height from all widgets */
    Dimension pathWidth = 0;
    for(int i=0;i<p->numSegments;i++) {
        Dimension segWidth;
        Dimension segHeight;
        XtVaGetValues(p->pathSegments[i], XmNwidth, &segWidth, XmNheight, &segHeight, NULL);
        segW[i] = segWidth;
        pathWidth += segWidth;
        if(segHeight > maxHeight) {
            maxHeight = segHeight;
        }
    }
    Dimension tfHeight;
    XtVaGetValues(p->textfield, XmNheight, &tfHeight, NULL);
    if(tfHeight > maxHeight) {
        maxHeight = tfHeight;
    }
    
    Boolean arrows = False;
    if(pathWidth + 10 > width) {
        arrows = True;
        pathWidth += p->lw + p->rw;
    }
    
    /* calc max visible widgets */
    int start = 0;
    if(arrows) {
        Dimension vis = p->lw+p->rw;
        for(int i=p->numSegments;i>0;i--) {
            Dimension segWidth = segW[i-1];
            if(vis + segWidth + 10 > width) {
                start = i;
                arrows = True;
                break;
            }
            vis += segWidth;
        }
    } else {
        p->shift = 0;
    }
    
    int leftShift = 0;
    if(p->shift < 0) {
        if(start + p->shift < 0) {
            leftShift = start;
            start = 0;
            p->shift = -leftShift;
        } else {
            leftShift = -p->shift; /* negative shift */
            start += p->shift;
        }
    }
    
    int x = 0;
    if(arrows) {
        XtManageChild(p->left);
        XtManageChild(p->right);
        x = p->lw;
    } else {
        XtUnmanageChild(p->left);
        XtUnmanageChild(p->right);
    }
    
    for(int i=0;i<p->numSegments;i++) {
        if(i >= start && i < p->numSegments - leftShift && !p->input) {
            XtVaSetValues(p->pathSegments[i], XmNx, x, XmNy, 0, XmNheight, maxHeight, NULL);
            x += segW[i];
            XtManageChild(p->pathSegments[i]);
        } else {
            XtUnmanageChild(p->pathSegments[i]);
        }
    }
    
    if(arrows) {
        XtVaSetValues(p->left, XmNx, 0, XmNy, 0, XmNheight, maxHeight, NULL);
        XtVaSetValues(p->right, XmNx, x, XmNy, 0, XmNheight, maxHeight, NULL);
    }
    
    free(segW);
    
    Dimension rw, rh;
    XtMakeResizeRequest(w, width, maxHeight, &rw, &rh);
    
    XtVaSetValues(p->textfield, XmNwidth, rw, XmNheight, rh, NULL);
}

static void pathbarActivateTF(PathBar *p)
{
    XtUnmanageChild(p->left);
    XtUnmanageChild(p->right);
    XNETextSetSelection(p->textfield, 0, XNETextGetLastPosition(p->textfield), 0);
    XtManageChild(p->textfield);
    p->input = 1;

    XmProcessTraversal(p->textfield, XmTRAVERSE_CURRENT);

    pathbar_resize(p->widget, p, NULL);
}

void PathBarActivateTextfield(PathBar *p)
{
    p->focus = 1;
    pathbarActivateTF(p);
}

void pathbar_input(Widget w, PathBar *p, XtPointer c)
{
    XmDrawingAreaCallbackStruct *cbs = (XmDrawingAreaCallbackStruct*)c;
    XEvent *xevent = cbs->event;
    
    if (cbs->reason == XmCR_INPUT) {
        if (xevent->xany.type == ButtonPress) {
            p->focus = 0;
            pathbarActivateTF(p);
        }
    }
}

void pathbar_losingfocus(Widget w, PathBar *p, XtPointer c)
{
    if(--p->focus < 0) {
        p->input = False;
        XtUnmanageChild(p->textfield);
    }
}

static cxmutstr concat_path_s(cxstring base, cxstring path) {
    if(!path.ptr) {
        path = CX_STR("");
    }
    
    int add_separator = 0;
    if(base.length != 0 && base.ptr[base.length-1] == '/') {
        if(path.ptr[0] == '/') {
            base.length--;
        }
    } else {
        if(path.length == 0 || path.ptr[0] != '/') {
            add_separator = 1;
        }
    }
    
    cxmutstr url;
    if(add_separator) {
        url = cx_strcat(3, base, CX_STR("/"), path);
    } else {
        url = cx_strcat(2, base, path);
    }
    
    return url;
}

static char* ConcatPath(const char *path1, const char *path2) {
    return concat_path_s(cx_str(path1), cx_str(path2)).ptr;
}

void pathbar_pathinput(Widget w, PathBar *p, XtPointer d)
{
    char *newpath = XNETextGetString(p->textfield);
    if(newpath) {
        if(newpath[0] == '~') {
            char *p = newpath+1;
            char *home = getenv("HOME");
            char *cp = ConcatPath(home, p);
            XtFree(newpath);
            newpath = cp;
        } else if(newpath[0] != '/') {
            char curdir[2048];
            curdir[0] = 0;
            getcwd(curdir, 2048);
            char *cp = ConcatPath(curdir, newpath);
            XtFree(newpath);
            newpath = cp;
        }
        
        /* update path */
        PathBarSetPath(p, newpath);
        if(p->updateDir) {
            p->updateDir(p->updateDirData, newpath);
        }
        XtFree(newpath);
        
        /* hide textfield and show path as buttons */
        XtUnmanageChild(p->textfield);
        pathbar_resize(p->widget, p, NULL);
        
        if(p->focus_widget) {
            XmProcessTraversal(p->focus_widget, XmTRAVERSE_CURRENT);
        }
    }
}

void pathbar_shift_left(Widget w, PathBar *p, XtPointer d)
{
    p->shift--;
    pathbar_resize(p->widget, p, NULL);
}

void pathbar_shift_right(Widget w, PathBar *p, XtPointer d)
{
    if(p->shift < 0) {
        p->shift++;
    }
    pathbar_resize(p->widget, p, NULL);
}

static void pathTextEH(Widget widget, XtPointer data, XEvent *event, Boolean *dispatch) {
    PathBar *pb = data;
    if(event->type == KeyReleaseMask) {
        if(event->xkey.keycode == 9) {
            XtUnmanageChild(pb->textfield);
            pathbar_resize(pb->widget, pb, NULL);
            *dispatch = False;
        } else if(event->xkey.keycode == 36) {
            pathbar_pathinput(pb->textfield, pb, NULL);
            *dispatch = False;
        }
    }
}

PathBar* CreatePathBar(Widget parent, ArgList args, int n)
{
    PathBar *bar = (PathBar*)XtMalloc(sizeof(PathBar));
    bar->path = NULL;
    bar->updateDir = NULL;
    bar->updateDirData = NULL;
    
    bar->focus_widget = NULL;
    
    bar->shift = 0;
    
    XtSetArg(args[n], XmNmarginWidth, 0); n++;
    XtSetArg(args[n], XmNmarginHeight, 0); n++;
    bar->widget = XmCreateDrawingArea(parent, "pathbar", args, n);
    XtAddCallback(
            bar->widget,
            XmNresizeCallback,
            (XtCallbackProc)pathbar_resize,
            bar);
    XtAddCallback(
            bar->widget,
            XmNinputCallback,
            (XtCallbackProc)pathbar_input,
            bar);
    
    Arg a[4];
    XtSetArg(a[0], XmNshadowThickness, 0);
    XtSetArg(a[1], XmNx, 0);
    XtSetArg(a[2], XmNy, 0);
    bar->textfield = XNECreateText(bar->widget, "pbtext", a, 3);
    bar->input = 0;
    XtAddCallback(
            bar->textfield,
            XmNlosingFocusCallback,
            (XtCallbackProc)pathbar_losingfocus,
            bar);
    XtAddCallback(bar->textfield, XmNactivateCallback,
                 (XtCallbackProc)pathbar_pathinput, bar);
    XtAddEventHandler(bar->textfield, KeyPressMask | KeyReleaseMask, FALSE, pathTextEH, bar);
    
    XtSetArg(a[0], XmNarrowDirection, XmARROW_LEFT);
    bar->left = XmCreateArrowButton(bar->widget, "pbbutton", a, 1);
    XtSetArg(a[0], XmNarrowDirection, XmARROW_RIGHT);
    bar->right = XmCreateArrowButton(bar->widget, "pbbutton", a, 1);
    XtAddCallback(
                bar->left,
                XmNactivateCallback,
                (XtCallbackProc)pathbar_shift_left,
                bar);
    XtAddCallback(
                bar->right,
                XmNactivateCallback,
                (XtCallbackProc)pathbar_shift_right,
                bar);
    
    Pixel bg;
    XtVaGetValues(bar->textfield, XmNbackground, &bg, NULL);
    XtVaSetValues(bar->widget, XmNbackground, bg, NULL);
    
    XtManageChild(bar->left);
    XtManageChild(bar->right);
    
    XtVaGetValues(bar->left, XmNwidth, &bar->lw, NULL);
    XtVaGetValues(bar->right, XmNwidth, &bar->rw, NULL);
    
    bar->segmentAlloc = 16;
    bar->numSegments = 0;
    bar->pathSegments = (Widget*)XtCalloc(16, sizeof(Widget));
    
    bar->selection = 0;
    
    return bar;
}

void PathBarChangeDir(Widget w, PathBar *bar, XtPointer c)
{
    XmToggleButtonSetState(bar->pathSegments[bar->selection], False, False);
    
    for(int i=0;i<bar->numSegments;i++) {  
        if(bar->pathSegments[i] == w) {
            bar->selection = i;
            XmToggleButtonSetState(w, True, False);
            break;
        }
    }
    
    int plen = strlen(bar->path);
    int countSeg = 0;
    for(int i=0;i<=plen;i++) {
        char c = bar->path[i];
        if(c == '/' || c == '\0') {
            if(countSeg == bar->selection) {
                char *dir = XtMalloc(i+2);
                memcpy(dir, bar->path, i+1);
                dir[i+1] = '\0';
                if(bar->updateDir) {
                    bar->updateDir(bar->updateDirData, dir);
                }
                free(dir);
            }
            countSeg++;
        }
    }
}

void PathBarSetPath(PathBar *bar, const char *path)
{
    if(bar->path) {
        free(bar->path);
    }
    bar->path = strdup(path);
    
    for(int i=0;i<bar->numSegments;i++) {
        XtDestroyWidget(bar->pathSegments[i]);
    }
    XtUnmanageChild(bar->textfield);
    XtManageChild(bar->left);
    XtManageChild(bar->right);
    bar->input = False;
    
    Arg args[4];
    XmString str;
    
    bar->numSegments = 0;
    
    int i=0;
    if(path[0] == '/') {
        str = XmStringCreateLocalized("/");
        XtSetArg(args[0], XmNlabelString, str);
        XtSetArg(args[1], XmNfillOnSelect, True);
        XtSetArg(args[2], XmNindicatorOn, False);
        bar->pathSegments[0] = XmCreateToggleButton(
                bar->widget, "pbbutton", args, 3);
        XtAddCallback(
                bar->pathSegments[0],
                XmNvalueChangedCallback,
                (XtCallbackProc)PathBarChangeDir,
                bar);
        XmStringFree(str);
        bar->numSegments++;
        i++;
    }
    
    int len = strlen(path);
    int begin = i;
    for(;i<=len;i++) {
        char c = path[i];
        if((c == '/' || c == '\0') && i > begin) {
            char *segStr = XtMalloc(i - begin + 1);
            memcpy(segStr, path+begin, i-begin);
            segStr[i-begin] = '\0';
            begin = i+1;
            
            str = XmStringCreateLocalized(segStr);
            XtFree(segStr);
            XtSetArg(args[0], XmNlabelString, str);
            XtSetArg(args[1], XmNfillOnSelect, True);
            XtSetArg(args[2], XmNindicatorOn, False);
            Widget button = XmCreateToggleButton(bar->widget, "pbbutton", args, 3);
            XtAddCallback(
                    button,
                    XmNvalueChangedCallback,
                    (XtCallbackProc)PathBarChangeDir,
                    bar);
            XmStringFree(str);
            
            if(bar->numSegments >= bar->segmentAlloc) {
                bar->segmentAlloc += 8;
                bar->pathSegments = realloc(bar->pathSegments, bar->segmentAlloc * sizeof(Widget));
            }
            
            bar->pathSegments[bar->numSegments++] = button;
        }
    }
    
    bar->selection = bar->numSegments-1;
    XmToggleButtonSetState(bar->pathSegments[bar->selection], True, False);
    
    XNETextSetString(bar->textfield, (char*)path);
    XNETextSetInsertionPosition(bar->textfield, XNETextGetLastPosition(bar->textfield));
    
    pathbar_resize(bar->widget, bar, NULL);
}

void PathBarDestroy(PathBar *pathbar) {
    if(pathbar->path) {
        XtFree(pathbar->path);
    }
    XtFree((void*)pathbar->pathSegments);
    XtFree((void*)pathbar);
}


/* ---------------------------- Path Text Field ---------------------------- */

static void destroy_pathbar(Widget w, XtPointer *data, XtPointer d) {
    PathBar *pathbar = (PathBar*)data;
    // TODO: check if there is somonething missing
    XtFree((void*)pathbar->pathSegments);
    XtFree((void*)pathbar);
}

UIWIDGET ui_path_textfield_create(UiObject* obj, UiPathTextFieldArgs args) {
    Arg xargs[16];
    int n = 0;
    
    UiContainerPrivate *ctn = ui_obj_container(obj);
    UI_APPLY_LAYOUT(ctn->layout, args);
    
    Widget parent = ctn->prepare(ctn, xargs, &n);
    // TODO: name
    
    PathBar *pathbar = CreatePathBar(parent, xargs, n);
    XtManageChild(pathbar->widget);
    ctn->add(ctn, pathbar->widget);
    
    UiVar* var = uic_widget_var(obj->ctx, obj->ctx, args.value, args.varname, UI_VAR_STRING);
    if (var) {
        UiString* value = (UiString*)var->value;
        value->obj = pathbar;
        value->get = ui_path_textfield_get;
        value->set = ui_path_textfield_set;
        
        if(value->value.ptr) {
            char *str = strdup(value->value.ptr);
            ui_string_set(value, str);
            free(str);
        }
    }
    
    XtAddCallback(
            pathbar->widget,
            XmNdestroyCallback,
            (XtCallbackProc)destroy_pathbar,
            pathbar);
    
    return pathbar->widget;
}

char* ui_path_textfield_get(UiString *str) {
   
}

void ui_path_textfield_set(UiString *str, const char *value) {
    PathBarSetPath(str->obj, value);
}