Changes in uspace/lib/gui/grid.c [6d5e378:feeac0d] in mainline

File:

• uspace/lib/gui/grid.c (modified) (9 diffs)

uspace/lib/gui/grid.c

@@ -1 +1 @@
 /*
  * Copyright (c) 2012 Petr Koupy
+ * Copyright (c) 2013 Martin Decky
  * All rights reserved.
  *
@@ -38 +39 @@
 #include <malloc.h>
 #include <surface.h>
-
 #include "window.h"
 #include "grid.h"
 
-static void paint_internal(widget_t *w)
-{
-        grid_t *grid = (grid_t *) w;
-
+typedef struct {
+        sysarg_t min;
+        sysarg_t max;
+        sysarg_t val;
+} constraints_t;
+
+static void paint_internal(widget_t *widget)
+{
+        grid_t *grid = (grid_t *) widget;
+        
         surface_t *surface = window_claim(grid->widget.window);
         if (!surface) {
                 window_yield(grid->widget.window);
-        }
-
-        for (sysarg_t y = w->vpos; y <  w->vpos + w->height; ++y) {
-                for (sysarg_t x = w->hpos; x < w->hpos + w->width; ++x) {
+                return;
+        }
+        
+        // FIXME: Replace with (accelerated) rectangle fill
+        for (sysarg_t y = widget->vpos; y < widget->vpos + widget->height; y++) {
+                for (sysarg_t x = widget->hpos; x < widget->hpos + widget->width; x++)
                         surface_put_pixel(surface, x, y, grid->background);
-                }
-        }
-
+        }
+        
         window_yield(grid->widget.window);
 }
 
-static widget_t **widget_at(grid_t *grid, size_t row, size_t col)
-{
-        if (row < grid->rows && col < grid->cols) {
+static grid_cell_t *grid_cell_at(grid_t *grid, size_t col, size_t row)
+{
+        if ((col < grid->cols) && (row < grid->rows))
                 return grid->layout + (row * grid->cols + col);
-        } else {
-                return NULL;
-        }
+        
+        return NULL;
+}
+
+static grid_cell_t *grid_coords_at(grid_t *grid, sysarg_t hpos, sysarg_t vpos)
+{
+        for (size_t c = 0; c < grid->cols; c++) {
+                for (size_t r = 0; r < grid->rows; r++) {
+                        grid_cell_t *cell = grid_cell_at(grid, c, r);
+                        if (cell) {
+                                widget_t *widget = cell->widget;
+                                
+                                if ((widget) && (hpos >= widget->hpos) &&
+                                    (vpos >= widget->vpos) &&
+                                    (hpos < widget->hpos + widget->width) &&
+                                    (vpos < widget->vpos + widget->height))
+                                        return cell;
+                        }
+                }
+        }
+        
+        return NULL;
 }
 
@@ -78 +104 @@
 {
         grid_t *grid = (grid_t *) widget;
-
+        
         deinit_grid(grid);
-
         free(grid);
 }
@@ -86 +111 @@
 static void grid_reconfigure(widget_t *widget)
 {
-        /* no-op */
+        /* No-op */
+}
+
+static void adjust_constraints(constraints_t *cons, size_t run,
+    sysarg_t dim_min, sysarg_t dim_max)
+{
+        assert(run > 0);
+        
+        sysarg_t dim_min_part = dim_min / run;
+        sysarg_t dim_min_rem = dim_min % run;
+        
+        sysarg_t dim_max_part = dim_max / run;
+        sysarg_t dim_max_rem = dim_max % run;
+        
+        for (size_t i = 0; i < run; i++) {
+                sysarg_t dim_min_cur = dim_min_part;
+                sysarg_t dim_max_cur = dim_max_part;
+                
+                if (i == run - 1) {
+                        dim_min_cur += dim_min_rem;
+                        dim_max_cur += dim_max_rem;
+                }
+                
+                /*
+                 * We want the strongest constraint
+                 * for the minimum.
+                 */
+                if (cons[i].min < dim_min_cur)
+                        cons[i].min = dim_min_cur;
+                
+                /*
+                 * The comparison is correct, we want
+                 * the weakest constraint for the
+                 * maximum.
+                 */
+                if (cons[i].max < dim_max_cur)
+                        cons[i].max = dim_max_cur;
+        }
+}
+
+static void solve_constraints(constraints_t *cons, size_t run, sysarg_t sum)
+{
+        /* Initial solution */
+        sysarg_t cur_sum = 0;
+        
+        for (size_t i = 0; i < run; i++) {
+                cons[i].val = cons[i].min;
+                cur_sum += cons[i].val;
+        }
+        
+        /* Iterative improvement */
+        while (cur_sum < sum) {
+                sysarg_t delta = (sum - cur_sum) / run;
+                if (delta == 0)
+                        break;
+                
+                cur_sum = 0;
+                
+                for (size_t i = 0; i < run; i++) {
+                        if (cons[i].val + delta < cons[i].max)
+                                cons[i].val += delta;
+                        
+                        cur_sum += cons[i].val;
+                }
+        }
 }
 
@@ -93 +182 @@
 {
         grid_t *grid = (grid_t *) widget;
-
+        
         widget_modify(widget, hpos, vpos, width, height);
         paint_internal(widget);
-
-        sysarg_t cell_width = width / grid->cols;
-        sysarg_t cell_height = height / grid->rows;
-
-        list_foreach(widget->children, link) {
-                widget_t *child = list_get_instance(link, widget_t, link);
-
-                sysarg_t widget_hpos = 0;
-                sysarg_t widget_vpos = 0;
-                sysarg_t widget_width = 0;
-                sysarg_t widget_height = 0;
-
-                size_t r = 0;
-                size_t c = 0;
-                for (r = 0; r < grid->rows; ++r) {
-                        bool found = false;
-                        for (c = 0; c < grid->cols; ++c) {
-                                widget_t **cell = widget_at(grid, r, c);
-                                if (cell && *cell == child) {
-                                        found = true;
-                                        break;
+        
+        /* Compute column widths */
+        constraints_t *widths =
+            (constraints_t *) calloc(grid->cols, sizeof(constraints_t));
+        if (widths) {
+                /* Constrain widths */
+                for (size_t c = 0; c < grid->cols; c++) {
+                        widths[c].min = 0;
+                        
+                        for (size_t r = 0; r < grid->rows; r++) {
+                                grid_cell_t *cell = grid_cell_at(grid, c, r);
+                                if (!cell)
+                                        continue;
+                                
+                                widget_t *widget = cell->widget;
+                                if (widget)
+                                        adjust_constraints(&widths[c], cell->cols,
+                                            widget->width_min, widget->width_max);
+                        }
+                }
+                
+                solve_constraints(widths, grid->cols, width);
+        }
+        
+        /* Compute row heights */
+        constraints_t *heights =
+            (constraints_t *) calloc(grid->rows, sizeof(constraints_t));
+        if (heights) {
+                /* Constrain heights */
+                for (size_t r = 0; r < grid->rows; r++) {
+                        heights[r].min = 0;
+                        
+                        for (size_t c = 0; c < grid->cols; c++) {
+                                grid_cell_t *cell = grid_cell_at(grid, c, r);
+                                if (!cell)
+                                        continue;
+                                
+                                widget_t *widget = cell->widget;
+                                if (widget) {
+                                        adjust_constraints(&heights[r], cell->rows,
+                                            widget->height_min, widget->height_max);
                                 }
                         }
-                        if (found) {
-                                break;
+                }
+                
+                solve_constraints(heights, grid->rows, height);
+        }
+        
+        /* Rearrange widgets */
+        if ((widths) && (heights)) {
+                sysarg_t cur_vpos = vpos;
+                
+                for (size_t r = 0; r < grid->rows; r++) {
+                        sysarg_t cur_hpos = hpos;
+                        
+                        for (size_t c = 0; c < grid->cols; c++) {
+                                grid_cell_t *cell = grid_cell_at(grid, c, r);
+                                if (!cell)
+                                        continue;
+                                
+                                widget_t *widget = cell->widget;
+                                if (widget) {
+                                        sysarg_t cur_width = 0;
+                                        sysarg_t cur_height = 0;
+                                        
+                                        for (size_t cd = 0; cd < cell->cols; cd++)
+                                                cur_width += widths[c + cd].val;
+                                        
+                                        for (size_t rd = 0; rd < cell->rows; rd++)
+                                                cur_height += heights[r + rd].val;
+                                        
+                                        if ((cur_width > 0) && (cur_height > 0)) {
+                                                sysarg_t wwidth = cur_width;
+                                                sysarg_t wheight = cur_height;
+                                                
+                                                /*
+                                                 * Make sure the widget is respects its
+                                                 * maximal constrains.
+                                                 */
+                                                
+                                                if ((widget->width_max > 0) &&
+                                                    (wwidth > widget->width_max))
+                                                        wwidth = widget->width_max;
+                                                
+                                                if ((widget->height_max > 0) &&
+                                                    (wheight > widget->height_max))
+                                                        wheight = widget->height_max;
+                                                
+                                                widget->rearrange(widget, cur_hpos, cur_vpos,
+                                                    wwidth, wheight);
+                                        }
+                                        
+                                        
+                                }
+                                
+                                cur_hpos += widths[c].val;
                         }
-                }
-
-                widget_hpos = cell_width * c + hpos;
-                widget_vpos = cell_height * r + vpos;
-
-                for (size_t _c = c; _c < grid->cols; ++_c) {
-                        widget_t **cell = widget_at(grid, r, _c);
-                        if (cell && *cell == child) {
-                                widget_width += cell_width;
-                        } else {
-                                break;
-                        }
-                }
-
-                for (size_t _r = r; _r < grid->rows; ++_r) {
-                        widget_t **cell = widget_at(grid, _r, c);
-                        if (cell && *cell == child) {
-                                widget_height += cell_height;
-                        } else {
-                                break;
-                        }
-                }
-
-                if (widget_width > 0 && widget_height > 0) {
-                        child->rearrange(child,
-                            widget_hpos, widget_vpos, widget_width, widget_height);
-                }
-        }
+                        
+                        cur_vpos += heights[r].val;
+                }
+        }
+        
+        if (widths)
+                free(widths);
+        
+        if (heights)
+                free(heights);
 }
 
@@ -155 +297 @@
 {
         paint_internal(widget);
-        list_foreach(widget->children, link) {
-                widget_t *child = list_get_instance(link, widget_t, link);
+        
+        list_foreach(widget->children, link, widget_t, child) {
                 child->repaint(child);
         }
+        
         window_damage(widget->window);
 }
@@ -164 +307 @@
 static void grid_handle_keyboard_event(widget_t *widget, kbd_event_t event)
 {
-        /* no-op */
+        /* No-op */
 }
 
@@ -170 +313 @@
 {
         grid_t *grid = (grid_t *) widget;
-
-        if ((widget->height / grid->rows) == 0) {
-                return;
-        }
-        if ((widget->width / grid->cols) == 0) {
-                return;
-        }
-
-        sysarg_t row = (event.vpos - widget->vpos) / (widget->height / grid->rows);
-        sysarg_t col = (event.hpos - widget->hpos) / (widget->width / grid->cols);
-
-        widget_t **cell = widget_at(grid, row, col);
-        if (cell && *cell) {
-                (*cell)->handle_position_event(*cell, event);
-        }
-}
-
-static void grid_add(grid_t *grid, widget_t *widget,
-    size_t row, size_t col, size_t rows, size_t cols)
-{
-        assert(row + rows <= grid->rows);
-        assert(col + cols <= grid->cols);
-
+        
+        grid_cell_t *cell = grid_coords_at(grid, event.hpos, event.vpos);
+        if ((cell) && (cell->widget))
+                cell->widget->handle_position_event(cell->widget, event);
+}
+
+static bool grid_add(struct grid *grid, widget_t *widget, size_t col,
+    size_t row, size_t cols, size_t rows)
+{
+        if ((cols == 0) || (rows == 0) || (col + cols > grid->cols) ||
+            (row + rows > grid->rows))
+                return false;
+        
+        grid_cell_t *cell = grid_cell_at(grid, col, row);
+        if (!cell)
+                return false;
+        
+        /*
+         * Check whether the cell is not occupied by an
+         * extension of a different cell.
+         */
+        if ((!cell->widget) && (cell->cols > 0) && (cell->rows > 0))
+                return false;
+        
         widget->parent = (widget_t *) grid;
+        
         list_append(&widget->link, &grid->widget.children);
         widget->window = grid->widget.window;
-
-        for (size_t r = row; r < row + rows; ++r) {
-                for (size_t c = col; c < col + cols; ++c) {
-                        widget_t **cell = widget_at(grid, r, c);
-                        if (cell) {
-                                *cell = widget;
+        
+        /* Mark cells in layout */
+        for (size_t r = row; r < row + rows; r++) {
+                for (size_t c = col; c < col + cols; c++) {
+                        if ((r == row) && (c == col)) {
+                                cell->widget = widget;
+                                cell->cols = cols;
+                                cell->rows = rows;
+                        } else {
+                                grid_cell_t *extension = grid_cell_at(grid, c, r);
+                                if (extension) {
+                                        extension->widget = NULL;
+                                        extension->cols = 1;
+                                        extension->rows = 1;
+                                }
                         }
                 }
         }
-}
-
-bool init_grid(grid_t *grid,
-    widget_t *parent, size_t rows, size_t cols, pixel_t background)
-{
-        assert(rows > 0);
-        assert(cols > 0);
-
-        widget_t **layout = (widget_t **) malloc(rows * cols * sizeof(widget_t *));
-        if (!layout) {
+        
+        return true;
+}
+
+bool init_grid(grid_t *grid, widget_t *parent, size_t cols, size_t rows,
+    pixel_t background)
+{
+        if ((cols == 0) || (rows == 0))
                 return false;
-        }
-        memset(layout, 0, rows * cols * sizeof(widget_t *));
-
+        
+        grid->layout =
+            (grid_cell_t *) calloc(cols * rows, sizeof(grid_cell_t));
+        if (!grid->layout)
+                return false;
+        
+        memset(grid->layout, 0, cols * rows * sizeof(grid_cell_t));
+        
         widget_init(&grid->widget, parent);
-
+        
         grid->widget.destroy = grid_destroy;
         grid->widget.reconfigure = grid_reconfigure;
@@ -227 +384 @@
         grid->widget.handle_keyboard_event = grid_handle_keyboard_event;
         grid->widget.handle_position_event = grid_handle_position_event;
-
+        
         grid->add = grid_add;
         grid->background = background;
+        grid->cols = cols;
         grid->rows = rows;
-        grid->cols = cols;
-        grid->layout = layout;
-
+        
         return true;
 }
 
-grid_t *create_grid(widget_t *parent, size_t rows, size_t cols, pixel_t background)
+grid_t *create_grid(widget_t *parent, size_t cols, size_t rows, pixel_t background)
 {
         grid_t *grid = (grid_t *) malloc(sizeof(grid_t));
-        if (!grid) {
+        if (!grid)
                 return NULL;
-        }
-
-        if (init_grid(grid, parent, rows, cols, background)) {
+        
+        if (init_grid(grid, parent, cols, rows, background))
                 return grid;
-        } else {
-                free(grid);
-                return NULL;
-        }
+        
+        free(grid);
+        return NULL;
 }