default/ui/motif/container.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 <inttypes.h>

#include "container.h"
#include "../common/context.h"
#include "../common/object.h"

#define UI_GRID_MAX_COLUMNS 512

static UiBool ui_lb2bool(UiLayoutBool b) {
    return b == UI_LAYOUT_TRUE ? TRUE : FALSE;
}

static UiLayoutBool ui_bool2lb(UiBool b) {
    return b ? UI_LAYOUT_TRUE : UI_LAYOUT_FALSE;
}


UiContainer* ui_frame_container(UiObject *obj, Widget frame) {
    UiContainer *ct = ucx_mempool_calloc(
            obj->ctx->mempool,
            1,
            sizeof(UiContainer));
    ct->widget = frame;
    ct->prepare = ui_frame_container_prepare;
    ct->add = ui_frame_container_add;
    return ct;
}

Widget ui_frame_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
    return ct->widget;
}

void ui_frame_container_add(UiContainer *ct, Widget widget) {
    ui_reset_layout(ct->layout);
    ct->current = widget;
}


UiContainer* ui_box_container(UiObject *obj, Widget box, int margin, int spacing, UiBoxOrientation orientation) {
    UiBoxContainer *ct = ucx_mempool_calloc(
            obj->ctx->mempool,
            1,
            sizeof(UiBoxContainer));
    ct->container.widget = box;
    ct->container.prepare = ui_box_container_prepare;
    ct->container.add = ui_box_container_add;
    ct->orientation = orientation;
    ct->margin = margin;
    ct->spacing = spacing;
    return (UiContainer*)ct;
}

Widget ui_box_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
    UiBoxContainer *bc = (UiBoxContainer*)ct;
    if(ct->layout.fill != UI_LAYOUT_UNDEFINED) {
        fill = ui_lb2bool(ct->layout.fill);
    }
    
    if(bc->has_fill && fill) {
        fprintf(stderr, "UiError: container has 2 filled widgets");
        fill = FALSE;
    }
    if(fill) {
        bc->has_fill = TRUE;
    }
    
    int a = *n;
    // determine fixed and dynamic attachments
    void *f1;
    void *f2;
    void *d1;
    void *d2;
    void *w1;
    void *w2;
    if(bc->orientation == UI_BOX_VERTICAL) {
        f1 = XmNleftAttachment;
        f2 = XmNrightAttachment;
        d1 = XmNtopAttachment;
        d2 = XmNbottomAttachment;
        w1 = XmNtopWidget;
        w2 = XmNbottomWidget;
        
        // margin/spacing
        XtSetArg(args[a], XmNleftOffset, bc->margin); a++;
        XtSetArg(args[a], XmNrightOffset, bc->margin); a++;
        
        XtSetArg(args[a], XmNtopOffset, bc->prev_widget ? bc->spacing : bc->margin); a++;
    } else {
        f1 = XmNtopAttachment;
        f2 = XmNbottomAttachment;
        d1 = XmNleftAttachment;
        d2 = XmNrightAttachment;
        w1 = XmNleftWidget;
        w2 = XmNrightWidget;
        
        // margin/spacing
        XtSetArg(args[a], XmNtopOffset, bc->margin); a++;
        XtSetArg(args[a], XmNbottomOffset, bc->margin); a++;
        
        XtSetArg(args[a], XmNleftOffset, bc->prev_widget ? bc->spacing : bc->margin); a++;
    }
    XtSetArg(args[a], f1, XmATTACH_FORM); a++;
    XtSetArg(args[a], f2, XmATTACH_FORM); a++;

    if(fill) {
        XtSetArg(args[a], d2, XmATTACH_FORM); a++;
    }
    if(bc->prev_widget) {
        XtSetArg(args[a], d1, XmATTACH_WIDGET); a++;
        XtSetArg(args[a], w1, bc->prev_widget); a++;
    } else {
        XtSetArg(args[a], d1, XmATTACH_FORM); a++;
    }
    
    *n = a;
    return ct->widget;
}

void ui_box_container_add(UiContainer *ct, Widget widget) {
    UiBoxContainer *bc = (UiBoxContainer*)ct;
    // determine dynamic attachments
    void *d1;
    void *d2;
    void *w1;
    void *w2;
    if(bc->orientation == UI_BOX_VERTICAL) {
        d1 = XmNtopAttachment;
        d2 = XmNbottomAttachment;
        w1 = XmNtopWidget;
        w2 = XmNbottomWidget;
        
    } else {
        d1 = XmNleftAttachment;
        d2 = XmNrightAttachment;
        w1 = XmNleftWidget;
        w2 = XmNrightWidget;
    }
    
    if(bc->prev_widget) {
        int v = 0;
        XtVaGetValues(bc->prev_widget, d2, &v, 0);
        if(v == XmATTACH_FORM) {
            XtVaSetValues(
                    bc->prev_widget,
                    d2,
                    XmATTACH_WIDGET,
                    w2,
                    widget,
                    0);
            XtVaSetValues(
                    widget,
                    d1,
                    XmATTACH_NONE,
                    d2,
                    XmATTACH_FORM,
                    0);
        }
    }
    bc->prev_widget = widget;
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}

UiContainer* ui_grid_container(UiObject *obj, Widget form, int columnspacing, int rowspacing) {
    UiGridContainer *ct = ucx_mempool_calloc(
            obj->ctx->mempool,
            1,
            sizeof(UiGridContainer));
    ct->container.widget = form;
    ct->container.prepare = ui_grid_container_prepare;
    ct->container.add = ui_grid_container_add;
    ct->columnspacing = columnspacing;
    ct->rowspacing = rowspacing;
    return (UiContainer*)ct;
}

void ui_grid_newline(UiGridContainer *grid) {
    if(grid->current) {
        grid->current = NULL;
    }
    grid->container.layout.newline = FALSE;
}

Widget ui_grid_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
    UiGridContainer *grid = (UiGridContainer*)ct;
    if(ct->layout.newline) {
        ui_grid_newline(grid);
    }
    return ct->widget;
}

void ui_grid_container_add(UiContainer *ct, Widget widget) {
    UiGridContainer *grid = (UiGridContainer*)ct;
    
    if(grid->current) {
        grid->current = ucx_list_append(grid->current, widget);
    } else {
        grid->current = ucx_list_append(grid->current, widget);
        grid->lines = ucx_list_append(grid->lines, grid->current);
    }
    
    ui_reset_layout(ct->layout);
    ct->current = widget;
}

static void ui_grid_resize(Widget widget, XtPointer udata, XtPointer cdata) {
    UiGridContainer *grid = udata;
    
    UcxList *rowdim = NULL;
    int coldim[UI_GRID_MAX_COLUMNS];
    memset(coldim, 0, UI_GRID_MAX_COLUMNS*sizeof(int));
    int numcol = 0;
    
    // get the minimum size of the columns and rows
    int sumw = 0;
    int sumh = 0;
    UCX_FOREACH(row, grid->lines) {
        int rheight = 0;
        int i=0;
        int sum_width = 0;
        UCX_FOREACH(elm, row->data) {
            Widget w = elm->data;
            int widget_width = 0;
            int widget_height = 0;
            XtVaGetValues(
                    w,
                    XmNwidth,
                    &widget_width,
                    XmNheight,
                    &widget_height, 
                    0);
            
            // get the maximum height in this row
            if(widget_height > rheight) {
                rheight = widget_height;
            }
            
            // get the maximum width in this column
            if(widget_width > coldim[i]) {
                coldim[i] = widget_width;
            }
            sum_width += widget_width;
            if(sum_width > sumw) {
                sumw = sum_width;
            }
            
            i++;
            if(i > numcol) {
                numcol = i;
            }
        }
        rowdim = ucx_list_append(rowdim, (void*)(intptr_t)rheight);
        sumh += rheight;
    }
    
    // check container size
    int gwidth = 0;
    int gheight = 0;
    XtVaGetValues(widget, XmNwidth, &gwidth, XmNheight, &gheight, NULL);
    if(gwidth < sumw || gheight < sumh) {
        XtVaSetValues(widget, XmNwidth, sumw, XmNheight, sumh, NULL);
        ucx_list_free(rowdim);
        return;
    }
    
    
    // adjust the positions of all children
    int y = 0;
    UCX_FOREACH(row, grid->lines) {
        int x = 0;       
        int i=0;
        UCX_FOREACH(elm, row->data) {
            Widget w = elm->data;
            XtVaSetValues(
                    w,
                    XmNx, x,
                    XmNy, y,
                    XmNwidth, coldim[i],
                    XmNheight, rowdim->data,
                    NULL);
            
            x += coldim[i];
            i++;
        }
        y += (intptr_t)rowdim->data;
        rowdim = rowdim->next;
    }
    
    ucx_list_free(rowdim);
}

UiContainer* ui_scrolledwindow_container(UiObject *obj, Widget scrolledwindow) {
    UiContainer *ct = ucx_mempool_calloc(
            obj->ctx->mempool,
            1,
            sizeof(UiContainer));
    ct->widget = scrolledwindow;
    ct->prepare = ui_scrolledwindow_container_prepare;
    ct->add = ui_scrolledwindow_container_add;
    return ct;
}

Widget ui_scrolledwindow_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
    return ct->widget;
}

void ui_scrolledwindow_container_add(UiContainer *ct, Widget widget) {
    ui_reset_layout(ct->layout);
    ct->current = widget;
}


UiContainer* ui_tabview_container(UiObject *obj, Widget frame) {
    UiTabViewContainer *ct = ucx_mempool_calloc(
            obj->ctx->mempool,
            1,
            sizeof(UiTabViewContainer));
    ct->context = obj->ctx;
    ct->container.widget = frame;
    ct->container.prepare = ui_tabview_container_prepare;
    ct->container.add = ui_tabview_container_add;
    return (UiContainer*)ct;
}

Widget ui_tabview_container_prepare(UiContainer *ct, Arg *args, int *n, UiBool fill) {
    int a = *n;
    XtSetArg(args[a], XmNleftAttachment, XmATTACH_FORM); a++;
    XtSetArg(args[a], XmNrightAttachment, XmATTACH_FORM); a++;
    XtSetArg(args[a], XmNtopAttachment, XmATTACH_FORM); a++;
    XtSetArg(args[a], XmNbottomAttachment, XmATTACH_FORM); a++;
    *n = a;
    return ct->widget;
}

void ui_tabview_container_add(UiContainer *ct, Widget widget) {
    UiTabViewContainer *tabview = (UiTabViewContainer*)ct; 
    
    if(tabview->current) {
        XtUnmanageChild(tabview->current);
    }

    tabview->current = widget;
    tabview->tabs = ucx_list_append(tabview->tabs, widget);
    
    ui_select_tab(ct->widget, 0);
    ui_reset_layout(ct->layout);
    ct->current = widget;
}

UIWIDGET ui_box(UiObject *obj, int margin, int spacing, UiBoxOrientation orientation) {
    UiContainer *ct = uic_get_current_container(obj);
    
    Arg args[16];
    int n = 0;
    Widget parent = ct->prepare(ct, args, &n, TRUE);
    Widget form = XmCreateForm(parent, "vbox", args, n);
    ct->add(ct, form);
    XtManageChild(form);
    
    UiObject *newobj = uic_object_new(obj, form);
    newobj->container = ui_box_container(obj, form, margin, spacing, orientation);
    uic_obj_add(obj, newobj);
    
    return form;
}

UIWIDGET ui_vbox(UiObject *obj) {
    return ui_box(obj, 0, 0, UI_BOX_VERTICAL);
}

UIWIDGET ui_hbox(UiObject *obj) {
    return ui_box(obj, 0, 0, UI_BOX_HORIZONTAL);
}

UIWIDGET ui_vbox_sp(UiObject *obj, int margin, int spacing) {
    return ui_box(obj, margin, spacing, UI_BOX_VERTICAL);
}

UIWIDGET ui_hbox_sp(UiObject *obj, int margin, int spacing) {
    return ui_box(obj, margin, spacing, UI_BOX_HORIZONTAL);
}

UIWIDGET ui_grid(UiObject *obj) {
    return ui_grid_sp(obj, 0, 0, 0);
}

UIWIDGET ui_grid_sp(UiObject *obj, int margin, int columnspacing, int rowspacing) {
    UiContainer *ct = uic_get_current_container(obj);
    
    Arg args[16];
    int n = 0;
    Widget parent = ct->prepare(ct, args, &n, TRUE);
    Widget grid = XmCreateDrawingArea(parent, "grid", args, n);
    ct->add(ct, grid);
    XtManageChild(grid);
    
    UiObject *newobj = uic_object_new(obj, grid);
    newobj->container = ui_grid_container(obj, grid, columnspacing, rowspacing);
    uic_obj_add(obj, newobj);
    
    XtAddCallback (grid, XmNresizeCallback , ui_grid_resize, newobj->container);
    
    return grid;
}

UIWIDGET ui_scrolledwindow(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    
    Arg args[16];
    int n = 0;
    XtSetArg(args[n], XmNscrollingPolicy, XmAUTOMATIC); // TODO: dosn't work, use XmAPPLICATION_DEFINED
    n++;
    Widget parent = ct->prepare(ct, args, &n, TRUE);
    Widget scrolledwindow = XmCreateScrolledWindow(parent, "scrolledwindow", args, n);
    ct->add(ct, scrolledwindow);
    XtManageChild(scrolledwindow);
    
    UiObject *newobj = uic_object_new(obj, scrolledwindow);
    newobj->container = ui_scrolledwindow_container(obj, scrolledwindow);
    uic_obj_add(obj, newobj);
    
    return scrolledwindow;
}

UIWIDGET ui_sidebar(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    
    Arg args[16];
    int n = 0;
    
    XtSetArg(args[n], XmNorientation, XmHORIZONTAL);
    n++;
    
    Widget parent = ct->prepare(ct, args, &n, TRUE);
    Widget pane = XmCreatePanedWindow(parent, "pane", args, n);
    ct->add(ct, pane);
    XtManageChild(pane);
    
    // add sidebar widget
    Widget sidebar = XmCreateForm(pane, "sidebar", args, 0);
    XtManageChild(sidebar);
    
    UiObject *left = uic_object_new(obj, sidebar);
    left->container = ui_box_container(left, sidebar, 0, 0, UI_BOX_VERTICAL);
    
    // add content widget
    XtSetArg (args[0], XmNpaneMaximum, 8000);
    Widget content = XmCreateForm(pane, "content_area", args, 1);
    XtManageChild(content);
    
    UiObject *right = uic_object_new(obj, content);
    right->container = ui_box_container(right, content, 0, 0, UI_BOX_VERTICAL);
    
    uic_obj_add(obj, right);
    uic_obj_add(obj, left);
    
    return sidebar;
}

UIWIDGET ui_tabview(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    
    // create a simple frame as container widget
    // when tabs are selected, the current child will be replaced by the
    // the new tab widget
    Arg args[16];
    int n = 0;
    XtSetArg(args[n], XmNshadowType, XmSHADOW_ETCHED_OUT);
    n++;
    XtSetArg(args[n], XmNshadowThickness, 0);
    n++;
    Widget parent = ct->prepare(ct, args, &n, TRUE);
    Widget form = XmCreateForm(parent, "tabview", args, n);
    ct->add(ct, form);
    XtManageChild(form);
    
    UiObject *tabviewobj = uic_object_new(obj, form);
    tabviewobj->container = ui_tabview_container(obj, form);
    uic_obj_add(obj, tabviewobj);
    
    XtVaSetValues(form, XmNuserData, tabviewobj->container, NULL);
    
    return form;
}

void ui_tab(UiObject *obj, char *title) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.label = title;
    
    ui_vbox(obj);
}

void ui_select_tab(UIWIDGET tabview, int tab) {
    UiTabViewContainer *ct = NULL;
    XtVaGetValues(tabview, XmNuserData, &ct, NULL);
    if(ct) {
        XtUnmanageChild(ct->current);
        UcxList *elm = ucx_list_get(ct->tabs, tab);
        if(elm) {
            XtManageChild(elm->data);
            ct->current = elm->data;
        } else {
            fprintf(stderr, "UiError: front tab index: %d\n", tab);
        }
    } else {
        fprintf(stderr, "UiError: widget is not a tabview\n");
    }
}


/* document tabview */

static void ui_tabbar_resize(Widget widget, XtPointer udata, XtPointer cdata) {
    MotifTabbedPane *v = (MotifTabbedPane*)udata;
    
    int width = 0;
    int height = 0;
    XtVaGetValues(widget, XmNwidth, &width, XmNheight, &height, NULL);
    int button_width = width / 4;
    int x = 0;
    UCX_FOREACH(elm, v->tabs) {
        UiTab *tab = elm->data;
        XtVaSetValues(
                tab->tab_button,
                XmNx, x,
                XmNy, 0,
                XmNwidth,
                button_width,
                
                NULL);
        x += button_width;
    }
    
    if(height <= v->height) {
        XtVaSetValues(widget, XmNheight, v->height + 4, NULL);
    }
}

static void ui_tabbar_expose(Widget widget, XtPointer udata, XtPointer cdata) {
    MotifTabbedPane *v = (MotifTabbedPane*)udata;
    XmDrawingAreaCallbackStruct *cbs = (XmDrawingAreaCallbackStruct *)cdata;
    XEvent *event = cbs->event;
    Display *dpy = XtDisplay(widget); 
    
    XGCValues gcvals;
    GC gc;
    Pixel fgpix;
    
    int tab_x;
    int tab_width;
    XtVaGetValues(v->current->tab_button, XmNx, &tab_x, XmNwidth, &tab_width, XmNhighlightColor, &fgpix, NULL);
    
    gcvals.foreground = v->bg1;
    gc = XCreateGC( dpy, XtWindow(widget), (GCForeground), &gcvals);
      
    int width = 0;
    int height = 0;
    XtVaGetValues(widget, XmNwidth, &width, XmNheight, &height, NULL);
    XFillRectangle(dpy, XtWindow(widget), gc, 0, 0, width, height);
    
    gcvals.foreground = fgpix;
    gc = XCreateGC( dpy, XtWindow(widget), (GCForeground), &gcvals);
    
    XFillRectangle(dpy, XtWindow(widget), gc, tab_x, 0, tab_width, height);
    
}

UiTabbedPane* ui_tabbed_document_view(UiObject *obj) {
    int n = 0;
    Arg args[16];
    
    UiContainer *ct = uic_get_current_container(obj);
    Widget parent = ct->prepare(ct, args, &n, TRUE);
    
    Widget tabview = XmCreateForm(parent, "tabview_form", args, n);
    XtManageChild(tabview);
    
    XtSetArg(args[0], XmNorientation, XmHORIZONTAL);
    XtSetArg(args[1], XmNpacking, XmPACK_TIGHT);
    XtSetArg(args[2], XmNspacing, 1);
    XtSetArg(args[3], XmNleftAttachment, XmATTACH_FORM);
    XtSetArg(args[4], XmNrightAttachment, XmATTACH_FORM);
    XtSetArg(args[5], XmNtopAttachment, XmATTACH_FORM);
    XtSetArg(args[6], XmNmarginWidth, 0);
    XtSetArg(args[7], XmNmarginHeight, 0);
    Widget tabbar = XmCreateDrawingArea(tabview, "tabbar", args, 8);
    XtManageChild(tabbar);
    
    XtSetArg(args[0], XmNleftAttachment, XmATTACH_FORM);
    XtSetArg(args[1], XmNrightAttachment, XmATTACH_FORM);
    XtSetArg(args[2], XmNtopAttachment, XmATTACH_WIDGET);
    XtSetArg(args[3], XmNtopWidget, tabbar);
    XtSetArg(args[4], XmNbottomAttachment, XmATTACH_FORM);
    XtSetArg(args[5], XmNshadowThickness, 0);
    Widget tabct = XmCreateForm(tabview, "tabview", args, 6);
    XtManageChild(tabct);
    
    MotifTabbedPane *tabbedpane = ui_malloc(obj->ctx, sizeof(MotifTabbedPane));
    tabbedpane->view.ctx = uic_current_obj(obj)->ctx;
    tabbedpane->view.widget = tabct;
    tabbedpane->view.document = NULL;
    tabbedpane->tabbar = tabbar;
    tabbedpane->tabs = NULL;
    tabbedpane->current = NULL;
    tabbedpane->height = 0;
    
    XtAddCallback(tabbar, XmNresizeCallback , ui_tabbar_resize, tabbedpane);
    XtAddCallback(tabbar, XmNexposeCallback, ui_tabbar_expose, tabbedpane);
    
    return &tabbedpane->view;
}

UiObject* ui_document_tab(UiTabbedPane *view) {
    MotifTabbedPane *v = (MotifTabbedPane*)view;
    int n = 0;
    Arg args[16];
    
    // hide the current tab content
    if(v->current) {
        XtUnmanageChild(v->current->content->widget);
    }
    
    UiTab *tab = ui_malloc(view->ctx, sizeof(UiTab));
    
    // create the new tab content
    XtSetArg(args[0], XmNshadowThickness, 0);
    XtSetArg(args[1], XmNleftAttachment, XmATTACH_FORM);
    XtSetArg(args[2], XmNrightAttachment, XmATTACH_FORM);
    XtSetArg(args[3], XmNtopAttachment, XmATTACH_FORM);
    XtSetArg(args[4], XmNbottomAttachment, XmATTACH_FORM);
    XtSetArg(args[5], XmNuserData, tab);
    Widget frame = XmCreateFrame(view->widget, "tab", args, 6);
    XtManageChild(frame);
    
    UiObject *content = ui_malloc(view->ctx, sizeof(UiObject));
    content->widget = NULL; // initialization for uic_context()
    content->ctx = uic_context(content, view->ctx->mempool);
    content->ctx->parent = view->ctx;
    content->ctx->set_document = ui_tab_set_document;
    content->ctx->detach_document = ui_tab_detach_document;
    content->widget = frame;
    content->window = view->ctx->obj->window;
    content->container = ui_frame_container(content, frame);
    content->next = NULL;
    
    // add tab button
    v->tabs = ucx_list_append_a(view->ctx->mempool->allocator, v->tabs, tab);
    
    XmString label = XmStringCreateLocalized("tab");
    XtSetArg(args[0], XmNlabelString, label);
    XtSetArg(args[1], XmNshadowThickness, 0);
    XtSetArg(args[2], XmNhighlightThickness, 0);
    
    Widget button = XmCreatePushButton(v->tabbar, "tab_button", args, 3);
    tab->tabbedpane = v;
    tab->content = content;
    tab->tab_button = button; 
    XtManageChild(button);
    XtAddCallback(
        button,
        XmNactivateCallback,
        (XtCallbackProc)ui_tab_button_callback,
        tab);
    
    if(v->height == 0) {
        XtVaGetValues(
                button,
                XmNarmColor,
                &v->bg1,
                XmNbackground,
                &v->bg2,
                XmNheight,
                &v->height,
                NULL);
        v->height += 2; // border
    }
    
    ui_change_tab(v, tab);
    ui_tabbar_resize(v->tabbar, v, NULL);
    
    return content;
}

void ui_tab_button_callback(Widget widget, UiTab *tab, XtPointer d) {  
    MotifTabbedPane *t = tab->tabbedpane;
    if(t->current) {
        XtUnmanageChild(t->current->content->widget);
        XtVaSetValues(t->current->tab_button, XmNset, 0, NULL);
    }
    XtManageChild(tab->content->widget);
    
    ui_change_tab(t, tab);
    
}

void ui_change_tab(MotifTabbedPane *pane, UiTab *tab) {
    UiContext *ctx = tab->content->ctx;
    ctx->parent->set_document(ctx->parent, ctx->document);
    
    if(pane->current) {
        XtVaSetValues(pane->current->tab_button, XmNshadowThickness, 0, XmNbackground, pane->bg1, NULL);
    }
    XtVaSetValues(tab->tab_button, XmNshadowThickness, 1, XmNbackground, pane->bg2, NULL);
    
    pane->current = tab;
    pane->index = ucx_list_find(pane->tabs, tab, NULL, NULL);
    printf("index: %d\n", pane->index);
    
    // redraw tabbar
    Display *dpy = XtDisplay(pane->tabbar);
    Window window = XtWindow(pane->tabbar);
    if(dpy && window) {
        XClearArea(dpy, XtWindow(pane->tabbar), 0, 0, 0, 0, TRUE);
        XFlush(dpy);
    }
}

void ui_tab_set_document(UiContext *ctx, void *document) {
    if(ctx->parent->document) {
        //ctx->parent->detach_document(ctx->parent, ctx->parent->document);
    }
    uic_context_set_document(ctx, document);
    //uic_context_set_document(ctx->parent, document);
    //ctx->parent->document = document;
    
    UiTab *tab = NULL;
    XtVaGetValues(
            ctx->obj->widget,
            XmNuserData,
            &tab,
            NULL);
    if(tab) {
        if(tab->tabbedpane->current == tab) {
            ctx->parent->set_document(ctx->parent, ctx->document);
        }
    } else {
        fprintf(stderr, "UiError: ui_bar_set_document: Cannot set document");
    }
}

void ui_tab_detach_document(UiContext *ctx) {
    uic_context_detach_document(ctx->parent);
}


/*
 * -------------------- Layout Functions --------------------
 * 
 * functions for setting layout attributes for the current container
 *
 */

void ui_layout_fill(UiObject *obj, UiBool fill) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.fill = ui_bool2lb(fill);
}

void ui_layout_hexpand(UiObject *obj, UiBool expand) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.hexpand = expand;
}

void ui_layout_vexpand(UiObject *obj, UiBool expand) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.vexpand = expand;
}

void ui_layout_gridwidth(UiObject *obj, int width) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.gridwidth = width;
}

void ui_newline(UiObject *obj) {
    UiContainer *ct = uic_get_current_container(obj);
    ct->layout.newline = TRUE;
}