diff -r 000000000000 -r 2483f517c562 ui/motif/container.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/motif/container.c	Sun Jan 21 16:30:18 2024 +0100
@@ -0,0 +1,814 @@
+/*
+ * 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"
+
+#include <cx/array_list.h>
+#include <cx/linked_list.h>
+#include <cx/compare.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 = cxCalloc(
+            obj->ctx->allocator,
+            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 = cxCalloc(
+            obj->ctx->allocator,
+            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, NULL);
+        if(v == XmATTACH_FORM) {
+            XtVaSetValues(
+                    bc->prev_widget,
+                    d2,
+                    XmATTACH_WIDGET,
+                    w2,
+                    widget,
+                    NULL);
+            XtVaSetValues(
+                    widget,
+                    d1,
+                    XmATTACH_NONE,
+                    d2,
+                    XmATTACH_FORM,
+                    NULL);
+        }
+    }
+    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 = cxCalloc(
+            obj->ctx->allocator,
+            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;
+    ct->lines = cxLinkedListCreateSimple(CX_STORE_POINTERS);
+    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) {
+        cxListAdd(grid->current, widget);
+    } else {
+        grid->current = cxLinkedListCreateSimple(CX_STORE_POINTERS);
+        cxListAdd(grid->current, widget);
+        cxListAdd(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;
+    
+    CxList *rowdim = cxArrayListCreateSimple(sizeof(int), grid->lines->size);
+    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;
+    CxIterator lineIterator = cxListIterator(grid->lines);
+    cx_foreach(CxList *, row, lineIterator) {
+        int rheight = 0;
+        int i=0;
+        int sum_width = 0;
+        CxIterator colIterator = cxListIterator(row);
+        cx_foreach(Widget, w, colIterator) {
+            int widget_width = 0;
+            int widget_height = 0;
+            XtVaGetValues(
+                    w,
+                    XmNwidth,
+                    &widget_width,
+                    XmNheight,
+                    &widget_height, 
+                    NULL);
+            
+            // 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;
+            }
+        }
+        cxListAdd(rowdim, &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);
+        cxListDestroy(rowdim);
+        return;
+    }
+    
+    
+    // adjust the positions of all children
+    int y = 0;
+    lineIterator = cxListIterator(grid->lines);
+    cx_foreach(CxList *, row, lineIterator) {
+        int x = 0;       
+        int i=0;
+        int *rowheight = cxListAt(rowdim, lineIterator.index);
+        CxIterator colIterator = cxListIterator(row);
+        cx_foreach(Widget, w, colIterator) {
+            XtVaSetValues(
+                    w,
+                    XmNx, x,
+                    XmNy, y,
+                    XmNwidth, coldim[i],
+                    XmNheight, *rowheight,
+                    NULL);
+            
+            x += coldim[i];
+            i++;
+        }
+        y += *rowheight;
+    }
+    
+    cxListDestroy(rowdim);
+}
+
+UiContainer* ui_scrolledwindow_container(UiObject *obj, Widget scrolledwindow) {
+    UiContainer *ct = cxCalloc(
+            obj->ctx->allocator,
+            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 = cxCalloc(
+            obj->ctx->allocator,
+            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;
+    ct->tabs = cxArrayListCreate(cxDefaultAllocator, cx_cmp_uintptr, CX_STORE_POINTERS, 16);
+    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;
+    cxListAdd(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);
+        Widget w = cxListAt(ct->tabs, tab);
+        if(w) {
+            XtManageChild(w);
+            ct->current = w;
+        } 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;
+    CxIterator tabIterator = cxListIterator(v->tabs);
+    cx_foreach(UiTab*, tab, tabIterator) {
+        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 = cxArrayListCreate(obj->ctx->allocator, cx_cmp_uintptr, CX_STORE_POINTERS, 16);
+    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->allocator);
+    content->ctx->parent = view->ctx;
+    content->ctx->attach_document = uic_context_attach_document;
+    content->ctx->detach_document2 = uic_context_detach_document2;
+    content->widget = frame;
+    content->window = view->ctx->obj->window;
+    content->container = ui_frame_container(content, frame);
+    content->next = NULL;
+    
+    // add tab button
+    cxListAdd(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->detach_document2(ctx->parent, pane->current->content->ctx->document);
+    ctx->parent->attach_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 = cxListFind(pane->tabs, tab);
+    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_attach_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->attach_document(ctx->parent, ctx->document);
+        }
+    } else {
+        fprintf(stderr, "UiError: ui_bar_set_document: Cannot set document");
+    }
+}
+
+
+
+/*
+ * -------------------- 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;
+}