corewindow.c

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/*
 * Copyright 2017 Chris Young <chris@unsatisfactorysoftware.co.uk>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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, see <http://www.gnu.org/licenses/>.
 */
 
/**
 * \file
 * Amiga core window interface.
 *
 * Provides interface for core renderers to the Amiga Intuition drawable area.
 *
 * This module is an object that must be encapsulated. Client users
 * should embed a struct ami_corewindow at the beginning of their
 * context for this display surface, fill in relevant data and then
 * call ami_corewindow_init()
 *
 * The Amiga core window structure requires the callback for draw, key and
 * mouse operations.
 */
 
#include "amiga/os3support.h"
 
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
 
#include "utils/log.h"
#include "utils/utils.h"
#include "utils/messages.h"
#include "utils/utf8.h"
#include "netsurf/keypress.h"
#include "netsurf/mouse.h"
#include "netsurf/plot_style.h"
 
#include <proto/exec.h>
#include <proto/graphics.h>
#include <proto/intuition.h>
#include <proto/layout.h>
#include <proto/utility.h>
 
#include <classes/window.h>
#include <gadgets/layout.h>
#include <gadgets/scroller.h>
#include <gadgets/space.h>
#include <intuition/icclass.h>
#include <reaction/reaction_macros.h>
 
#include "amiga/corewindow.h"
#include "amiga/drag.h"
#include "amiga/memory.h"
#include "amiga/misc.h"
#include "amiga/object.h"
#include "amiga/schedule.h"
#include "amiga/utf8.h"
 
static void
ami_cw_scroller_top(struct ami_corewindow *ami_cw,
                    ULONG *restrict x,
                    ULONG *restrict y)
{
        ULONG xs = 0;
        ULONG ys = 0;
 
        if(ami_cw->scroll_x_visible == true) {
                GetAttr(SCROLLER_Top, ami_cw->objects[GID_CW_HSCROLL], &xs);
        }
 
        if(ami_cw->scroll_y_visible == true) {
                GetAttr(SCROLLER_Top, ami_cw->objects[GID_CW_VSCROLL], &ys);
        }
 
        *x = xs;
        *y = ys;
}
 
static void
ami_cw_window_size(struct ami_corewindow *ami_cw, int *width, int *height)
{
        struct IBox *bbox;
 
        if(ami_gui_get_space_box((Object *)ami_cw->objects[GID_CW_DRAW], &bbox) != NSERROR_OK) {
                amiga_warn_user("NoMemory", "");
                return;
        }
 
        *width = bbox->Width;
        *height = bbox->Height;
 
        ami_gui_free_space_box(bbox);
}
 
 
/**
 * Convert co-ordinates relative to space.gadget
 * into document co-ordinates
 *
 * @param ami_cw core window
 * @param x co-ordinate, will be updated to new x co-ordinate
 * @param y co-ordinate, will be updated to new y co-ordinate
 */
static void
ami_cw_coord_amiga_to_ns(struct ami_corewindow *ami_cw, int *restrict x, int *restrict y)
{
        ULONG xs = 0;
        ULONG ys = 0;
 
        ami_cw_scroller_top(ami_cw, &xs, &ys);
 
        *x = *x + xs;
        *y = *y + ys;
}
 
/**
 * check if mouse has moved since position was stored
 * @param ami_cw corewindow
 * @param x current x position
 * @param y current y position
 * @param click true to check since last click, false since last drag (press)
 * @return true if it has, false otherwise
 */
static bool
ami_cw_mouse_moved(struct ami_corewindow *ami_cw, int x, int y, bool click)
{
        int mx, my;
 
        if(click == true) {
                mx = ami_cw->mouse_x_click;
                my = ami_cw->mouse_y_click;
        } else {
                mx = ami_cw->drag_x_start;
                my = ami_cw->drag_y_start;
        }
 
        if(abs(x - mx) > 5) return true;
        if(abs(y - my) > 5) return true;
        return false;
}
 
/* get current mouse position in the draw area, adjusted for scroll.
 * @return true if the mouse was in the draw area and co-ordinates updated
 */
static bool
ami_cw_mouse_pos(struct ami_corewindow *ami_cw, int *restrict x, int *restrict y)
{
        int16 xm, ym;
        ULONG xs, ys;
        struct IBox *bbox;
 
        xm = ami_cw->win->MouseX;
        ym = ami_cw->win->MouseY;
 
        if(ami_gui_get_space_box((Object *)ami_cw->objects[GID_CW_DRAW], &bbox) != NSERROR_OK) {
                amiga_warn_user("NoMemory", "");
                return false;
        }
 
        xm -= bbox->Left;
        ym -= bbox->Top;
 
        if((xm < 0) || (ym < 0) || (xm > bbox->Width) || (ym > bbox->Height))
                return false;
 
        ami_gui_free_space_box(bbox);
        ami_cw_scroller_top(ami_cw, &xs, &ys);
 
        xm += xs;
        ym += ys;
        *x = xm;
        *y = ym;
 
        return true;
}
 
/* handle keypress */
static void
ami_cw_key(struct ami_corewindow *ami_cw, int nskey)
{
        ami_cw->key(ami_cw, nskey);
 
        switch(nskey) {
                case NS_KEY_COPY_SELECTION:
                        /* if we've copied a selection we need to clear it - style guide rules */
                        ami_cw->key(ami_cw, NS_KEY_CLEAR_SELECTION);
                break;
 
                /* we may need to deal with scroll-related keys here */
        }
}
 
 
/**
 * Redraw functions
 *
 * This is slightly over-engineered as it was taken from the main
 * browser/old tree redraws and supports deferred drawing of
 * rectangles and tiling
 */
 
/**
 * Redraw an area of a core window
 *
 * \param ami_cw An Amiga core window structure
 * \param r rect (in document co-ordinates)
 */
 
static void
ami_cw_redraw_rect(struct ami_corewindow *ami_cw, struct rect *r)
{
        struct IBox *bbox;
        ULONG pos_x, pos_y;
        struct rect draw_rect;
        int tile_size_x;
        int tile_size_y;
        int tile_x, tile_y, tile_w, tile_h;
        int x = r->x0;
        int y = r->y0;
        int width = r->x1 - r->x0;
        int height = r->y1 - r->y0;
 
        struct redraw_context ctx = {
                .interactive = true,
                .background_images = true,
                .plot = &amiplot,
                .priv = ami_cw->gg
        };
 
        if(ami_gui_get_space_box((Object *)ami_cw->objects[GID_CW_DRAW], &bbox) != NSERROR_OK) {
                amiga_warn_user("NoMemory", "");
                return;
        }
 
        ami_cw_scroller_top(ami_cw, &pos_x, &pos_y);
 
        if(x - (LONG)pos_x + width > bbox->Width) width = bbox->Width - (x - pos_x);
        if(y - (LONG)pos_y + height > bbox->Height) height = bbox->Height - (y - pos_y);
 
        if(x < (LONG)pos_x) {
                width -= pos_x - x;
                x = pos_x;
        }
 
        if(y < (LONG)pos_y) {
                height -= pos_y - y;
                y = pos_y;
        }
 
        ami_plot_ra_get_size(ami_cw->gg, &tile_size_x, &tile_size_y);
 
        for(tile_y = y; tile_y < (y + height); tile_y += tile_size_y) {
                tile_h = tile_size_y;
                if(((y + height) - tile_y) < tile_size_y)
                        tile_h = (y + height) - tile_y;
 
                for(tile_x = x; tile_x < (x + width); tile_x += tile_size_x) {
                        tile_w = tile_size_x;
                        if(((x + width) - tile_x) < tile_size_x)
                                tile_w = (x + width) - tile_x;
 
                        draw_rect.x0 = tile_x; // was -
                        draw_rect.y0 = tile_y; // was -
                        draw_rect.x1 = tile_x + tile_w;
                        draw_rect.y1 = tile_y + tile_h;
 
                        ami_cw->draw(ami_cw, -tile_x, -tile_y, &draw_rect, &ctx);
 
#ifdef __amigaos4__
                        BltBitMapTags(BLITA_SrcType, BLITT_BITMAP, 
                                        BLITA_Source, ami_plot_ra_get_bitmap(ami_cw->gg),
                                        BLITA_SrcX, 0,
                                        BLITA_SrcY, 0,
                                        BLITA_DestType, BLITT_RASTPORT, 
                                        BLITA_Dest, ami_cw->win->RPort,
                                        BLITA_DestX, bbox->Left + tile_x - pos_x,
                                        BLITA_DestY, bbox->Top + tile_y - pos_y,
                                        BLITA_Width, tile_w,
                                        BLITA_Height, tile_h,
                                        TAG_DONE);
#else
                        BltBitMapRastPort(ami_plot_ra_get_bitmap(ami_cw->gg), 0, 0,
                                        ami_cw->win->RPort, bbox->Left + tile_x - pos_x, bbox->Top + tile_y - pos_y,
                                        tile_w, tile_h, 0xC0);
#endif
                }
        }
 
        ami_gui_free_space_box(bbox);
        ami_clearclipreg(ami_cw->gg);
}
 
 
/**
 * Draw the deferred rectangles
 *
 * \param ami_cw An Amiga core window structure to queue redraw
 * \param draw set to false to just delete the queue
 */
static void ami_cw_redraw_queue(struct ami_corewindow *ami_cw, bool draw)
{
        struct nsObject *node;
        struct nsObject *nnode;
        struct rect *rect;
        
        if(IsMinListEmpty(ami_cw->deferred_rects)) return;
 
        if(draw == false) {
                NSLOG(netsurf, INFO, "Ignoring deferred box redraw queue");
        } // else should probably show busy pointer
 
        node = (struct nsObject *)GetHead((struct List *)ami_cw->deferred_rects);
 
        do {
                if(draw == true) {
                        rect = (struct rect *)node->objstruct;
                        ami_cw_redraw_rect(ami_cw, rect);
                }
                nnode = (struct nsObject *)GetSucc((struct Node *)node);
                ami_memory_itempool_free(ami_cw->deferred_rects_pool, node->objstruct, sizeof(struct rect));
                DelObjectNoFree(node);
        } while((node = nnode));
}
 
static void
ami_cw_redraw_cb(void *p)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)p;
 
        ami_cw_redraw_queue(ami_cw, true);
}
 
/**
 * Queue a redraw of a rectangle
 *
 * @param ami_cw the core window to redraw
 * @param r the rectangle (in doc coords) to redraw, or NULL for full window
 */
 
static void
ami_cw_redraw(struct ami_corewindow *ami_cw, const struct rect *restrict r)
{
        struct nsObject *nsobj;
        struct rect *restrict deferred_rect;
        struct rect new_rect;
 
        if(r == NULL) {
                struct IBox *bbox;
                if(ami_gui_get_space_box((Object *)ami_cw->objects[GID_CW_DRAW], &bbox) != NSERROR_OK) {
                        amiga_warn_user("NoMemory", "");
                        return;
                }
 
                new_rect.x0 = 0;
                new_rect.y0 = 0;
                ami_cw_coord_amiga_to_ns(ami_cw, &new_rect.x0, &new_rect.y0);
                new_rect.x1 = new_rect.x0 + bbox->Width;
                new_rect.y1 = new_rect.y0 + bbox->Height;
 
                ami_gui_free_space_box(bbox);
 
                r = &new_rect;
        }
 
        if(ami_gui_window_update_box_deferred_check(ami_cw->deferred_rects, r,
                        ami_cw->deferred_rects_pool)) {
                deferred_rect = ami_memory_itempool_alloc(ami_cw->deferred_rects_pool, sizeof(struct rect));
                CopyMem(r, deferred_rect, sizeof(struct rect));
                nsobj = AddObject(ami_cw->deferred_rects, AMINS_RECT);
                nsobj->objstruct = deferred_rect;
        } else {
                NSLOG(netsurf, INFO,
                      "Ignoring duplicate or subset of queued box redraw");
        }
        ami_schedule(1, ami_cw_redraw_cb, ami_cw);
}
 
static void ami_cw_simplerefresh(struct ami_corewindow *ami_cw)
{
        struct rect r;
        struct RegionRectangle *regrect;
 
        BeginRefresh(ami_cw->win);
 
        r.x0 = ami_cw->win->RPort->Layer->DamageList->bounds.MinX;
        r.x1 = ami_cw->win->RPort->Layer->DamageList->bounds.MaxX;
        r.y0 = ami_cw->win->RPort->Layer->DamageList->bounds.MinY;
        r.y1 = ami_cw->win->RPort->Layer->DamageList->bounds.MaxY;
 
        ami_cw_coord_amiga_to_ns(ami_cw, &r.x0, &r.y0);
        ami_cw_coord_amiga_to_ns(ami_cw, &r.y0, &r.y1);
 
        regrect = ami_cw->win->RPort->Layer->DamageList->RegionRectangle;
 
        ami_cw_redraw(ami_cw, &r); /* queue redraw */
 
        while(regrect) {
                r.x0 = regrect->bounds.MinX;
                r.x1 = regrect->bounds.MaxX;
                r.y0 = regrect->bounds.MinY;
                r.y1 = regrect->bounds.MaxY;
                ami_cw_coord_amiga_to_ns(ami_cw, &r.x0, &r.y0);
                ami_cw_coord_amiga_to_ns(ami_cw, &r.y0, &r.y1);
 
                regrect = regrect->Next;
 
                ami_cw_redraw(ami_cw, &r); /* queue redraw */
        }
 
        EndRefresh(ami_cw->win, TRUE);
}
 
static void
ami_cw_toggle_scrollbar(struct ami_corewindow *ami_cw, bool vert, bool visible)
{
        Object *scroller;
        Object *layout;
        ULONG tag;
 
        if(vert == true) {
                if(visible == ami_cw->scroll_y_visible) {
                        return;
                } else {
                        scroller = ami_cw->objects[GID_CW_VSCROLL];
                        layout = ami_cw->objects[GID_CW_VSCROLLLAYOUT];
                        tag = WINDOW_VertProp;
                        ami_cw->scroll_y_visible = visible;
                }
        } else {
                if(visible == ami_cw->scroll_x_visible) {
                        return;
                } else {
                        scroller = ami_cw->objects[GID_CW_HSCROLL];
                        layout = ami_cw->objects[GID_CW_HSCROLLLAYOUT];
                        tag = WINDOW_HorizProp;
                        ami_cw->scroll_x_visible = visible;
                }
        }
 
        if(visible == true) {
                if(ami_cw->in_border_scroll == true) {
                        SetAttrs(ami_cw->objects[GID_CW_WIN],
                                tag, 1,
                                TAG_DONE);
                } else {
#ifdef __amigaos4__
                        IDoMethod(layout, LM_ADDCHILD, ami_cw->win, scroller, NULL);
#else
                        SetAttrs(layout, LAYOUT_AddChild, scroller, TAG_DONE);
#endif
                }
        } else {
                if(ami_cw->in_border_scroll == true) {
                        SetAttrs(ami_cw->objects[GID_CW_WIN],
                                tag, -1,
                                TAG_DONE);
                } else {
#ifdef __amigaos4__
                        IDoMethod(layout, LM_REMOVECHILD, ami_cw->win, scroller);
#else
                        SetAttrs(layout, LAYOUT_RemoveChild, scroller, TAG_DONE);
#endif
                }
        }
 
        if(ami_cw->in_border_scroll == false) {
                FlushLayoutDomainCache((struct Gadget *)ami_cw->objects[GID_CW_WIN]);
                RethinkLayout((struct Gadget *)ami_cw->objects[GID_CW_WIN],
                                        ami_cw->win, NULL, TRUE);
        }
 
        /* probably need to redraw here */
        ami_cw_redraw(ami_cw, NULL);
}
 
static void
ami_cw_close(void *w)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)w;
 
        ami_cw->close(ami_cw);
}
 
HOOKF(void, ami_cw_idcmp_hook, Object *, object, struct IntuiMessage *) 
{
        struct ami_corewindow *ami_cw = hook->h_Data;
        struct IntuiWheelData *wheel;
        ULONG gid = GetTagData( GA_ID, 0, msg->IAddress ); 
 
        switch(msg->Class)
        {
                case IDCMP_IDCMPUPDATE:
                        switch(gid) 
                        {
                                case GID_CW_HSCROLL: 
                                case GID_CW_VSCROLL:
                                        ami_cw_redraw(ami_cw, NULL);
                                break; 
                        } 
                break;
#ifdef __amigaos4__
                case IDCMP_EXTENDEDMOUSE:
                        if(msg->Code == IMSGCODE_INTUIWHEELDATA)
                        {
                                wheel = (struct IntuiWheelData *)msg->IAddress;
 
                                //ami_tree_scroll(twin, (wheel->WheelX * 20), (wheel->WheelY * 20));
                        }
                break;
#endif
 
                case IDCMP_SIZEVERIFY:
                break;
 
                case IDCMP_REFRESHWINDOW:
                        ami_cw_simplerefresh(ami_cw);
                break;
 
                default:
                        NSLOG(netsurf, INFO,
                              "IDCMP hook unhandled event: %ld", msg->Class);
                break;
        }
} 
 
/**
 * Drag start
 */
static void
ami_cw_drag_start(struct ami_corewindow *ami_cw, int x, int y)
{
        if(ami_cw->dragging == true) return;
 
        ami_cw->dragging = true;
        ami_cw->drag_x_start = x;
        ami_cw->drag_y_start = y;
 
        switch(ami_cw->drag_status) {
                case CORE_WINDOW_DRAG_SELECTION:
                break;
 
                case CORE_WINDOW_DRAG_MOVE:
                        ami_drag_icon_show(ami_cw->win, "project");
                break;
 
                default:
                break;
        }
}
 
/**
 * Drag progress
 */
static void
ami_cw_drag_progress(struct ami_corewindow *ami_cw, int x, int y)
{
        if(ami_cw->dragging == false) return;
 
        switch(ami_cw->drag_status) {
                case CORE_WINDOW_DRAG_SELECTION:
                break;
 
                case CORE_WINDOW_DRAG_MOVE:
                        ami_drag_icon_move();
                break;
 
                default:
                break;
        }
}
 
/**
 * Drag end
 */
static void
ami_cw_drag_end(struct ami_corewindow *ami_cw, int x, int y)
{
        if(ami_cw->dragging == false) return;
        struct Screen *scrn = ami_gui_get_screen();
 
        switch(ami_cw->drag_status) {
                case CORE_WINDOW_DRAG_SELECTION:
                break;
 
                case CORE_WINDOW_DRAG_MOVE:
                        ami_drag_icon_close(ami_cw->win);
                        if((ami_cw != ami_window_at_pointer(AMINS_COREWINDOW)) && (ami_cw->drag_end != NULL)) {
                                ami_cw->drag_end(ami_cw, scrn->MouseX, scrn->MouseY);
                        }
                break;
 
                default:
                break;
        }
 
        ami_cw->drag_status = CORE_WINDOW_DRAG_NONE;
        ami_cw->dragging = false;
}
 
/**
 * User has resized window
 */
 
static void
ami_cw_newsize(struct ami_corewindow *ami_cw)
{
        int win_w, win_h;
        ami_cw_window_size(ami_cw, &win_w, &win_h);
 
        if(ami_cw->objects[GID_CW_HSCROLL] != NULL) {
                RefreshSetGadgetAttrs((struct Gadget *)ami_cw->objects[GID_CW_HSCROLL], ami_cw->win, NULL,
                        SCROLLER_Visible, win_w,
                TAG_DONE);
        }       
 
        if(ami_cw->objects[GID_CW_VSCROLL] != NULL) {
                RefreshSetGadgetAttrs((struct Gadget *)ami_cw->objects[GID_CW_VSCROLL], ami_cw->win, NULL,
                        SCROLLER_Visible, win_h,
                TAG_DONE);
        }
 
        ami_cw_redraw(ami_cw, NULL);
}
 
/**
 * Main event loop for our core window
 *
 * \return TRUE if window destroyed
 */
static BOOL
ami_cw_event(void *w)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)w;
 
        ULONG result;
        ULONG storage;
        uint16 code;
        struct InputEvent *ie;
        int nskey;
        int key_state = 0;
        struct timeval curtime;
        int x = 0, y = 0;
 
        while((result = RA_HandleInput(ami_cw->objects[GID_CW_WIN], &code)) != WMHI_LASTMSG) {
                if(ami_cw->close_window == true) {
                        ami_cw_close(ami_cw);
                        return TRUE;
                }
 
                switch(result & WMHI_CLASSMASK) {
                        case WMHI_MOUSEMOVE:
                                if(ami_cw_mouse_pos(ami_cw, &x, &y) == true) {
                                        if(ami_cw_mouse_moved(ami_cw, x, y, false)) {
                                                if(ami_cw->mouse_state & BROWSER_MOUSE_PRESS_1) {
                                                        /* Start button 1 drag */
                                                        ami_cw->mouse(ami_cw, BROWSER_MOUSE_DRAG_1, x, y);
                                                        /* Replace PRESS with HOLDING and declare drag in progress */
                                                        ami_cw->mouse_state = BROWSER_MOUSE_HOLDING_1 | BROWSER_MOUSE_DRAG_ON;
                                                } else if(ami_cw->mouse_state & BROWSER_MOUSE_PRESS_2) {
                                                        /* Start button 2 drag */
                                                        ami_cw->mouse(ami_cw, BROWSER_MOUSE_DRAG_2, x, y);
                                                        /* Replace PRESS with HOLDING and declare drag in progress */
                                                        ami_cw->mouse_state = BROWSER_MOUSE_HOLDING_2 | BROWSER_MOUSE_DRAG_ON;
                                                }
                                                key_state = ami_gui_get_quals(ami_cw->objects[GID_CW_WIN]);
                                                ami_cw->mouse(ami_cw, ami_cw->mouse_state | key_state, x, y);
                                                if(ami_cw->mouse_state & BROWSER_MOUSE_DRAG_ON) {
                                                        ami_cw_drag_start(ami_cw, x, y);
                                                }
                                        } else {
                                                key_state = ami_gui_get_quals(ami_cw->objects[GID_CW_WIN]);
                                                ami_cw->mouse(ami_cw, ami_cw->mouse_state | key_state, x, y);
                                        }
                                }
                                ami_cw_drag_progress(ami_cw, x, y);
                        break;
 
                        case WMHI_MOUSEBUTTONS:
                                if(ami_cw_mouse_pos(ami_cw, &x, &y) == true) {
                                        key_state = ami_gui_get_quals(ami_cw->objects[GID_CW_WIN]);
                                        switch(code) {
                                                case SELECTDOWN:
                                                        ami_cw->mouse_state = BROWSER_MOUSE_PRESS_1;
                                                        ami_cw->drag_x_start = x;
                                                        ami_cw->drag_y_start = y;
                                                break;
 
                                                case MIDDLEDOWN:
                                                        ami_cw->mouse_state = BROWSER_MOUSE_PRESS_2;
                                                        ami_cw->drag_x_start = x;
                                                        ami_cw->drag_y_start = y;
                                                break;
 
                                                case SELECTUP:
                                                        if(ami_cw->mouse_state & BROWSER_MOUSE_PRESS_1) {
                                                                CurrentTime((ULONG *)&curtime.tv_sec, (ULONG *)&curtime.tv_usec);
 
                                                                ami_cw->mouse_state = BROWSER_MOUSE_CLICK_1;
 
                                                                if(ami_cw->lastclick.tv_sec) {
                                                                        if((ami_cw_mouse_moved(ami_cw, x, y, true) == false) &&
                                                                                        (DoubleClick(ami_cw->lastclick.tv_sec,
                                                                                                ami_cw->lastclick.tv_usec,
                                                                                                curtime.tv_sec, curtime.tv_usec)))
                                                                                ami_cw->mouse_state |= BROWSER_MOUSE_DOUBLE_CLICK;
                                                                }
 
                                                                ami_cw->mouse_x_click = x;
                                                                ami_cw->mouse_y_click = y;
 
                                                                if(ami_cw->mouse_state & BROWSER_MOUSE_DOUBLE_CLICK) {
                                                                        ami_cw->lastclick.tv_sec = 0;
                                                                        ami_cw->lastclick.tv_usec = 0;
                                                                } else {
                                                                        ami_cw->lastclick.tv_sec = curtime.tv_sec;
                                                                        ami_cw->lastclick.tv_usec = curtime.tv_usec;
                                                                }
                                                        }
 
                                                        ami_cw->mouse(ami_cw, ami_cw->mouse_state | key_state, x, y);
                                                        ami_cw->mouse_state = BROWSER_MOUSE_HOVER;
                                                break;
 
                                                case MIDDLEUP:
                                                        if(ami_cw->mouse_state & BROWSER_MOUSE_PRESS_2)
                                                                ami_cw->mouse_state = BROWSER_MOUSE_CLICK_2;
 
                                                        ami_cw->mouse(ami_cw, ami_cw->mouse_state | key_state, x, y);
                                                        ami_cw->mouse_state = BROWSER_MOUSE_HOVER;
                                                break;
                                        }
 
                                        if(ami_cw->mouse_state == BROWSER_MOUSE_HOVER) {
                                                ami_cw_drag_end(ami_cw, x, y);
                                        }
 
                                        ami_cw->mouse(ami_cw, ami_cw->mouse_state | key_state, x, y);
                                } else {
                                        /* event is happening away from our corewindow area */
                                        switch(code) {
                                                case SELECTUP:
                                                case MIDDLEUP:
                                                        ami_cw->mouse_state = BROWSER_MOUSE_HOVER;
                                                break;
 
                                                default:
                                                break;
                                        }
 
                                        if(ami_cw->mouse_state == BROWSER_MOUSE_HOVER) {
                                                ami_cw_drag_end(ami_cw, x, y);
                                                ami_cw->mouse(ami_cw, ami_cw->mouse_state | key_state,
                                                        ami_cw->drag_x_start, ami_cw->drag_y_start); // placate core
                                        }
                                }
                        break;
 
                        case WMHI_RAWKEY:
                                storage = result & WMHI_GADGETMASK;
 
                                GetAttr(WINDOW_InputEvent, ami_cw->objects[GID_CW_WIN], (ULONG *)&ie);
                                nskey = ami_key_to_nskey(storage, ie);
 
                                ami_cw_key(ami_cw, nskey);
                        break;
 
                        case WMHI_NEWSIZE:
                                ami_cw_newsize(ami_cw);
                        break;
 
                        case WMHI_CLOSEWINDOW:
                                ami_cw_close(ami_cw);
                                return TRUE;
                        break;
 
                        default:
                                /* pass the event to the window owner */
                                if(ami_cw->event != NULL)
                                        if(ami_cw->event(ami_cw, result) == TRUE) {
                                                return TRUE;
                                        }
                        break;
                }
        };
 
        return FALSE;
}
 
static const struct ami_win_event_table ami_cw_table = {
        ami_cw_event,
        ami_cw_close,
};
 
 
/**
 * callback from core to request an invalidation of a amiga core window area.
 *
 * The specified area of the window should now be considered
 *  out of date. If the area is NULL the entire window must be
 *  invalidated.
 *
 * \param[in] cw The core window to invalidate.
 * \param[in] r area to redraw or NULL for the entire window area.
 * \return NSERROR_OK on success or appropriate error code.
 */
static nserror
ami_cw_invalidate_area(struct core_window *cw, const struct rect *r)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)cw;
 
        ami_cw_redraw(ami_cw, r);
 
        return NSERROR_OK;
}
 
 
static nserror
ami_cw_get_window_dimensions(const struct core_window *cw,
                int *width, int *height)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)cw;
 
        ami_cw_window_size(ami_cw, width, height);
        return NSERROR_OK;
}
 
 
static nserror
ami_cw_update_size(struct core_window *cw, int width, int height)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)cw;
        int win_w, win_h;
 
        ami_cw_window_size(ami_cw, &win_w, &win_h);
 
        if(width == -1) {
                ami_cw_toggle_scrollbar(ami_cw, false, false);
        } else {
                ami_cw_toggle_scrollbar(ami_cw, false, true);
                RefreshSetGadgetAttrs((struct Gadget *)ami_cw->objects[GID_CW_HSCROLL], ami_cw->win, NULL,
                        SCROLLER_Total, (ULONG)width,
                        SCROLLER_Visible, win_w,
                TAG_DONE);              
        }
 
        if(height == -1) {
                ami_cw_toggle_scrollbar(ami_cw, true, false);
        } else {
                ami_cw_toggle_scrollbar(ami_cw, true, true);
                RefreshSetGadgetAttrs((struct Gadget *)ami_cw->objects[GID_CW_VSCROLL], ami_cw->win, NULL,
                        SCROLLER_Total, height,
                        SCROLLER_Visible, win_h,
                TAG_DONE);              
        }
        return NSERROR_OK;
}
 
 
static nserror
ami_cw_get_scroll(const struct core_window *cw, int *x, int *y)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)cw;
        ULONG win_x0, win_y0;
 
        ami_cw_scroller_top(ami_cw, &win_x0, &win_y0);
 
        *x = win_x0;
        *y = win_y0;
        return NSERROR_OK;
}
 
 
static nserror
ami_cw_set_scroll(struct core_window *cw, int x, int y)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)cw;
 
        if(ami_cw->scroll_y_visible == true) {
                RefreshSetGadgetAttrs((APTR)ami_cw->objects[GID_CW_VSCROLL], ami_cw->win, NULL,
                                SCROLLER_Top, y,
                                TAG_DONE);
        }
 
        if(ami_cw->scroll_x_visible == true) {
                RefreshSetGadgetAttrs((APTR)ami_cw->objects[GID_CW_HSCROLL], ami_cw->win, NULL,
                                SCROLLER_Top, x,
                                TAG_DONE);
        }
 
        /* probably need to redraw here */
        ami_cw_redraw(ami_cw, NULL);
        return NSERROR_OK;
}
 
 
static nserror
ami_cw_drag_status(struct core_window *cw, core_window_drag_status ds)
{
        struct ami_corewindow *ami_cw = (struct ami_corewindow *)cw;
        ami_cw->drag_status = ds;
        return NSERROR_OK;
}
 
 
struct core_window_callback_table ami_cw_cb_table = {
        .invalidate = ami_cw_invalidate_area,
        .update_size = ami_cw_update_size,
        .set_scroll = ami_cw_set_scroll,
        .get_scroll = ami_cw_get_scroll,
        .get_window_dimensions = ami_cw_get_window_dimensions,
        .drag_status = ami_cw_drag_status
};
 
/* exported function documented example/corewindow.h */
nserror ami_corewindow_init(struct ami_corewindow *ami_cw)
{
        /* setup the core window callback table */
        ami_cw->cb_table = &ami_cw_cb_table;
        ami_cw->drag_status = CORE_WINDOW_DRAG_NONE;
 
        /* clear some vars */
        ami_cw->mouse_state = BROWSER_MOUSE_HOVER;
        ami_cw->lastclick.tv_sec = 0;
        ami_cw->lastclick.tv_usec = 0;
        ami_cw->scroll_x_visible = true;
        ami_cw->scroll_y_visible = true;
        ami_cw->in_border_scroll = false;
        ami_cw->dragging = false;
 
        /* allocate drawing area etc */
        ami_cw->gg = ami_plot_ra_alloc(100, 100, false, true); // force tiles to save memory
 
        ami_cw->deferred_rects = NewObjList();
        ami_cw->deferred_rects_pool = ami_memory_itempool_create(sizeof(struct rect));
 
        /* add the core window to our window list so we process events */
        ami_gui_win_list_add(ami_cw, AMINS_COREWINDOW, &ami_cw_table);
 
        /* set up the IDCMP hook for event processing (extended mouse, scrollbars) */
        ami_cw->idcmp_hook.h_Entry = (void *)ami_cw_idcmp_hook;
        ami_cw->idcmp_hook.h_Data = ami_cw;
 
        /* open the window */
        ami_cw->win = (struct Window *)RA_OpenWindow(ami_cw->objects[GID_CW_WIN]);
 
        /* attach the scrollbars for event processing _if they are in the window border_ */
        if(ami_cw->objects[GID_CW_HSCROLL] == NULL) {
                GetAttr(WINDOW_HorizObject, ami_cw->objects[GID_CW_WIN],
                                        (ULONG *)&ami_cw->objects[GID_CW_HSCROLL]);
 
                RefreshSetGadgetAttrs((APTR)ami_cw->objects[GID_CW_HSCROLL], ami_cw->win, NULL,
                        GA_ID, GID_CW_HSCROLL,
                        ICA_TARGET, ICTARGET_IDCMP,
                        TAG_DONE);
 
                ami_cw->in_border_scroll = true;
        }
 
        if(ami_cw->objects[GID_CW_VSCROLL] == NULL) {
                GetAttr(WINDOW_VertObject, ami_cw->objects[GID_CW_WIN],
                                        (ULONG *)&ami_cw->objects[GID_CW_VSCROLL]);
 
                RefreshSetGadgetAttrs((APTR)ami_cw->objects[GID_CW_VSCROLL], ami_cw->win, NULL,
                        GA_ID, GID_CW_VSCROLL,
                        ICA_TARGET, ICTARGET_IDCMP,
                        TAG_DONE);
 
                ami_cw->in_border_scroll = true;
        }
 
        return NSERROR_OK;
}
 
/* exported interface documented in example/corewindow.h */
nserror ami_corewindow_fini(struct ami_corewindow *ami_cw)
{
        /* remove any pending redraws */
        ami_schedule(-1, ami_cw_redraw_cb, ami_cw);
        FreeObjList(ami_cw->deferred_rects);
        ami_memory_itempool_delete(ami_cw->deferred_rects_pool);
 
        /* destroy the window */
        ami_cw->win = NULL;
        DisposeObject(ami_cw->objects[GID_CW_WIN]);
 
#if 0
        /* ensure our scrollbars are destroyed */
        /* it appears these are disposed anyway,
         * even if the gadgets are no longer attached to the window */
        if(ami_cw->in_border_scroll == false) {
                if(ami_cw->scroll_x_visible == false) {
                        DisposeObject(ami_cw->objects[GID_CW_HSCROLL]);
                }
                if(ami_cw->scroll_y_visible == false) {
                        DisposeObject(ami_cw->objects[GID_CW_VSCROLL]);
                }
        }
#endif
 
        /* release off-screen bitmap stuff */
        ami_plot_ra_free(ami_cw->gg);
 
        /* free the window title */
        ami_utf8_free(ami_cw->wintitle);
 
        /* remove the core window from our window list */
        ami_gui_win_list_remove(ami_cw);
 
        return NSERROR_OK;
}