roo_e/roo-e/src/gui/wmwindow.c

/*
 *  Roo/E, the Kangaroo Punch Portable GUI Toolkit
 *  Copyright (C) 2022 Scott Duensing
 *
 *  http://kangaroopunch.com
 *
 *
 *  This file is part of Roo/E.
 *
 *  Roo/E is free software: you can redistribute it and/or modify it under the
 *  terms of the GNU Affero General Public License as published by the Free
 *  Software Foundation, either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  Roo/E 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 Affero General Public License
 *  along with Roo/E. If not, see <https://www.gnu.org/licenses/>.
 *
 */


#include "wmwindow.h"
#include "array.h"
#include "font.h"


uint8_t  __MAGIC_WINDOW = 0;


static WindowT **_windowList   = NULL;
static WindowT  *_windowTop    = NULL;
static int16_t   _iconCount    = 0;


static void     windowCache(WindowT *w, uint8_t redrawWindow);
static void     windowDestroy(struct WidgetS *widget, ...);
static void     windowPaint(struct WidgetS *widget, ...);
static WidgetT *windowWidgetFinder(WidgetT *widget, uint16_t x, uint16_t y, int16_t *localX,  int16_t *localY);


static void windowCache(WindowT *w, uint8_t redrawWindow) {
	char      c;
	int16_t   i;
	int16_t   x1;
	int16_t   y1;
	int16_t   x2;
	int16_t   y2;
	int16_t   tx1;
	int16_t   tx2;
	int16_t   ty2;
	int16_t   originalX;
	int16_t   originalY;
	ColorT    titleBackgroundColor;
	ColorT    gadgetColor;
	SurfaceT *target = surfaceGet();

	// Do we have a cached surface already?  ***TODO*** Maybe allocate maximum size right at the start?
	if (w->cached) {
		// Did the size grow?
		if ((surfaceWidthGet(w->cached) < w->base.r.w) || (surfaceHeightGet(w->cached) < w->base.r.h)) {
			// Yeah.  We will recreate it.
			surfaceDestroy(&w->cached);
		}
	}
	// Do we need to create a surface?
	if (!w->cached) w->cached = surfaceCreate(w->base.r.w, w->base.r.h);

	// Draw into cache.
	surfaceSet(w->cached);

	// Does the window itself need redrawn or just the contents?
	if (redrawWindow) {
		// Move the window to 0,0 to draw it into it's own surface.
		originalX   = w->base.r.x;
		originalY   = w->base.r.y;
		w->base.r.x = 0;
		w->base.r.y = 0;

		// Determine some colors.
		titleBackgroundColor  = (w == _windowTop) ? GUI_DARKGRAY  : GUI_LIGHTGRAY;
		gadgetColor           = (w == _windowTop) ? GUI_LIGHTGRAY : GUI_DARKGRAY;

		// Get ready!
		x1 = w->base.r.x;
		y1 = w->base.r.y;
		x2 = w->base.r.x + w->base.r.w - 1;
		y2 = w->base.r.y + w->base.r.h - 1;

		// Draw border.
		surfaceBoxHighlight(x1, y1, x2, y2, GUI_WHITE, GUI_BLACK);
		x1++;  y1++;  x2--;  y2--;
		for (i=0; i<3; i++) {
			surfaceBox(x1, y1, x2, y2, GUI_LIGHTGRAY);
			x1++;  y1++;  x2--;  y2--;
		}
		surfaceBoxHighlight(x1, y1, x2, y2, GUI_BLACK, GUI_WHITE);
		x1++;  y1++;  x2--;  y2--;

		// Do we need a titlebar?
		if (w->title || w->flags & WIN_CLOSE || w->flags & WIN_MAXIMIZE || w->flags & WIN_MINIMIZE) {
			tx1 = x1;
			tx2 = x2;
			ty2 = y1 + GADGET_SIZE;

			// Close box?
			if (w->flags & WIN_CLOSE) {
				tx1 += GADGET_SIZE;
				w->close.x  = x1;
				w->close.y  = y1;
				w->close.x2 = tx1 - 1;
				w->close.y2 = ty2 - 1;
				surfaceBoxFilled(w->close.x + 1, w->close.y + 1, w->close.x2 - 1, w->close.y2 - 1, titleBackgroundColor);
				surfaceBoxHighlight(w->close.x + 3, w->close.y + 8, w->close.x2 - 3, w->close.y2 - 8, GUI_WHITE, gadgetColor);
				surfaceBoxHighlight(w->close.x, w->close.y, w->close.x2, w->close.y2, GUI_WHITE, GUI_BLACK);
			} else {
				w->close.x = w->close.y = w->close.x2 = w->close.y2 = 0;
			}

			// Maximize box?
			if (w->flags & WIN_MAXIMIZE) {
				tx2 -= GADGET_SIZE;
				w->maximize.x  = tx2 + 1;
				w->maximize.y  = y1;
				w->maximize.x2 = tx2 + GADGET_SIZE;
				w->maximize.y2 = ty2 - 1;
				surfaceBoxFilled(w->maximize.x + 1, w->maximize.y + 1, w->maximize.x2 - 1, w->maximize.y2 - 1, titleBackgroundColor);
				surfaceLine(w->maximize.x + 4, w->maximize.y + 10, w->maximize.x + 10, w->maximize.y + 4, GUI_WHITE);
				surfaceLine(w->maximize.x + 4, w->maximize.y + 10, w->maximize.x + 10, w->maximize.y2 - 3, GUI_WHITE);
				surfaceLine(w->maximize.x2 - 3, w->maximize.y + 10, w->maximize.x2 - 9, w->maximize.y + 4, gadgetColor);
				surfaceLine(w->maximize.x2 - 3, w->maximize.y + 10, w->maximize.x2 - 9, w->maximize.y2 - 3, gadgetColor);
				surfaceBoxHighlight(w->maximize.x, w->maximize.y, w->maximize.x2, w->maximize.y2, GUI_WHITE, GUI_BLACK);
			} else {
				w->maximize.x = w->maximize.y = w->maximize.x2 = w->maximize.y2 = 0;
			}

			// Minimize box?
			if (w->flags & WIN_MINIMIZE) {
				tx2 -= GADGET_SIZE;
				w->minimize.x  = tx2 + 1;
				w->minimize.y  = y1;
				w->minimize.x2 = tx2 + GADGET_SIZE;
				w->minimize.y2 = ty2 - 1;
				surfaceBoxFilled(w->minimize.x + 1, w->minimize.y + 1, w->minimize.x2 - 1, w->minimize.y2 - 1, titleBackgroundColor);
				surfaceBoxHighlight(w->minimize.x + 7, w->minimize.y + 7, w->minimize.x2 - 7, w->minimize.y2 - 7, GUI_WHITE, gadgetColor);
				surfaceBoxHighlight(w->minimize.x, w->minimize.y, w->minimize.x2, w->minimize.y2, GUI_WHITE, GUI_BLACK);
			} else {
				w->minimize.x = w->minimize.y = w->minimize.x2 = w->maximize.y2 = 0;
			}

			// Draw titlebar background.
			w->titlebar.x  = tx1;
			w->titlebar.y  = y1;
			w->titlebar.x2 = tx2;
			w->titlebar.y2 = ty2 - 1;
			surfaceBoxFilled(w->titlebar.x + 1, w->titlebar.y + 1, w->titlebar.x2 - 1, w->titlebar.y2 - 1, titleBackgroundColor);
			if (w->title) {
				// Prepare font.  Don't allow color changes in titles.
				fontSet(__guiFontVGA8x16);
				fontColorSet(GUI_WHITE, titleBackgroundColor);
				fontModsEnabledSet(0);
				// How many characters do we have room for?
				i = ((w->titlebar.x2 - w->titlebar.x) >> 3) - 2;
				// Does the title fit?
				if ((int16_t)strlen(w->title) <= i) {
					// Render entire title.
					fontRender(w->title, w->titlebar.x + 12, w->titlebar.y + 2);
				} else {
					// Render partial title.
					c = w->title[i];
					w->title[i] = 0;
					fontRender(w->title, w->titlebar.x + 12, w->titlebar.y + 2);
					w->title[i] = c;
				}
			}
			surfaceBoxHighlight(w->titlebar.x, w->titlebar.y, w->titlebar.x2, w->titlebar.y2, GUI_WHITE, GUI_BLACK);

			y1 += GADGET_SIZE;
		} else {
			w->close.x    = w->close.y    = w->close.x2    = w->close.y2    = 0;
			w->maximize.x = w->maximize.y = w->maximize.x2 = w->maximize.y2 = 0;
			w->minimize.x = w->minimize.y = w->minimize.x2 = w->maximize.y2 = 0;
			w->titlebar.x = w->titlebar.y = w->titlebar.x2 = w->titlebar.y2 = 0;
		}

		// Resize handle.
		if (w->flags & WIN_RESIZE) {
			w->resize1.x2 = w->base.r.x + w->base.r.w - 2;
			w->resize1.x  = w->resize1.x2 - 3;
			w->resize1.y2 = w->base.r.y + w->base.r.h;
			w->resize1.y  = w->resize1.y2 - (GADGET_SIZE + 5);
			surfaceLineH(w->resize1.x, w->resize1.x2, w->resize1.y,     GUI_BLACK);
			surfaceLineH(w->resize1.x, w->resize1.x2, w->resize1.y + 1, GUI_WHITE);
			w->resize2.x2 = w->base.r.x + w->base.r.w;
			w->resize2.x  = w->resize2.x2 - (GADGET_SIZE + 5);
			w->resize2.y2 = w->base.r.y + w->base.r.h - 2;
			w->resize2.y  = w->resize2.y2 - 3;
			surfaceLineV(w->resize2.x,     w->resize2.y, w->resize2.y2, GUI_BLACK);
			surfaceLineV(w->resize2.x + 1, w->resize2.y, w->resize2.y2, GUI_WHITE);
		} else {
			w->resize1.x = w->resize1.y = w->resize1.x2 = w->resize1.y2 = 0;
			w->resize2.x = w->resize2.y = w->resize2.x2 = w->resize2.y2 = 0;
		}

		// Inside window frame.
		w->bounds.x  = x1;
		w->bounds.y  = y1;
		w->bounds.x2 = x2;
		w->bounds.y2 = y2;

		// Resize scrollable to fill window.
		if (w->scroll) {
			w->scroll->base.r.x = x1;
			w->scroll->base.r.y = y1;
			scrollableWidthSet(w->scroll,  x2 - x1);
			scrollableHeightSet(w->scroll, y2 - y1);
		}

		// Fixup all the widget coordinates.
		windowMove(w, originalX, originalY);
	}  // Redraw window.

	// Draw contents.
	widgetChildrenPaint(W(w));

	surfaceSet(target);
}


// Passing "flags" as a default int provides proper alignment for the following va_args list.
WindowT *windowCreate(uint16_t x, uint16_t y, uint16_t w, uint16_t h, char *title, int flags, ...) {
	PointT    visibleSize;
	PointT    totalSize;
	va_list   args;
	WindowT  *win    = NULL;
	int8_t    sflags = SCROLLABLE_NONE;

	NEW(WindowT, win);
	memset(win, 0, sizeof(WindowT));
	widgetBaseSet((WidgetT *)win, __MAGIC_WINDOW, w, h);
	win->base.r.x = x;
	win->base.r.y = y;
	win->title    = strdup(title);
	win->flags    = (uint8_t)flags;

	// Cache the window so we get valid bounds values.
	windowCache(win, 1);
	visibleSize.x = win->bounds.x2 - win->bounds.x + 1;
	visibleSize.y = win->bounds.y2 - win->bounds.y + 1;

	// If the window is resizable, we need to get two more arguments for the content size.
	if (win->flags & WIN_RESIZE) {
		va_start(args, flags);
		totalSize.x = va_arg(args, int);
		totalSize.y = va_arg(args, int);
		va_end(args);
		sflags = SCROLLABLE_STANDARD;
	} else {
		// Use whatever the default content area is.  This causes an extra draw on create.  Oh well.
		totalSize = visibleSize;
		widgetDirtySet(W(win), 1);
		if (flags & WIN_SCROLL_H) sflags |= SCROLLABLE_SCROLL_H;
		if (flags & WIN_SCROLL_V) sflags |= SCROLLABLE_SCROLL_V;
	}

	win->scroll = scrollableCreate(visibleSize.x, visibleSize.y, totalSize.x, totalSize.y, sflags);
	win->scroll->base.flags |= WIDGET_IS_WINDOW;
	widgetAdd(W(win), 0, 0, W(win->scroll));

	// Add to window list.
	arrput(_windowList, win);

	// Focus us.
	windowFocusSet(win);

	return win;
}


static void windowDestroy(struct WidgetS *widget, ...) {
	uint16_t  i;
	uint16_t  c;
	WindowT  *window = (WindowT *)widget;

	// Remove it from the window list, if it exists there.
	for (i=0; i<arrlen(_windowList); i++) {
		if (window == _windowList[i]) {
			_windowList[i] = NULL;
			arrdel(_windowList, i);
			break;
		}
	}

	// Was it the focused window?
	if (window == _windowTop) {
		// Find new topmost window on next call to focus.
		_windowTop = NULL;
	}
	// Free the title.
	if (window->title) DEL(window->title);
	// Free children.
	for (c=0; c<arrlen(window->base.children); c++) widgetDestroy(window->base.children[c]);
	arrfree(window->base.children);
	// Free cached surface.
	if (window->cached) surfaceDestroy(&window->cached);
	// Delete the window.
	DEL(window);
	// Fixup focus.
	windowFocusSet(NULL);
}


void windowFocusSet(WindowT *win) {
	int16_t i;

	// Do we have a focused window at the moment?
	if (!_windowTop || !win) {
		_windowTop = NULL;
		// If there's a list of windows, use the topmost non-minimized.
		if (arrlen(_windowList) > 0) {
			// Work backwards through the window list.
			i = arrlen(_windowList) - 1;
			for (; i>=0; i--) {
				if (_windowList[i]->flags & WIN_IS_ICON) {
					// Minimized window.  Skip it.
					continue;
				} else {
					// Open window.  Use as new top.
					_windowTop = _windowList[i];
					widgetDirtySet(W(_windowTop), 1);
					break;
				}
			}
		}
	}

	// Did they even pass in a window?  If not, we're just intended to fixup _windowTop.
	if (!win) return;

	// Were we already the topmost window?
	if (win == _windowTop) return;

	// Is this window minimized?
	if (win->flags & WIN_IS_ICON) {
		// Can't receive focus - find new top.
		windowFocusSet(NULL);
		return;
	}

	// Mark old focus and new focus dirty to repaint title bar.
	widgetDirtySet(W(win), 1);
	widgetDirtySet(W(_windowTop), 1);

	// Change who has focus.
	_windowTop = win;

	// Reorder window list.
	i = arrlen(_windowList) - 2;
	if (i >= 0) {
		for (; i>=0; i--) {
			if (_windowList[i] == win) {
				arrdel(_windowList, i);
				arrput(_windowList, win);
				break;
			}
		}
	}
}


void windowMaximizeRestore(WindowT *win) {
	int16_t i;

	// Are we maximized?
	if (win->flags & WIN_IS_MAX) {

		// Restore to previous size and offset.
		win->flags &= ~WIN_IS_MAX;
		win->base.r = win->restore;
		// Update the window so we have new values calculated.
		windowCache(win, 1);
		// Now move the scroll position.
		win->scroll->offset = win->restoreOffset;
		scrollableValueHSet(win->scroll, win->restoreOffset.x);
		scrollableValueVSet(win->scroll, win->restoreOffset.y);

	} else {  // Maximized?

		// Maximize window.  Reposition if needed.
		win->flags |= WIN_IS_MAX;

		// Remember current size and offset.
		win->restore       = win->base.r;
		win->restoreOffset = win->scroll->offset;

		// Expand to full contents.
		win->base.r.w = (win->base.r.w - (win->bounds.x2 - win->bounds.x) + surfaceWidthGet(win->scroll->area) + (win->scroll->scrollv ? win->scroll->scrollv->base.r.w - 1: 0));
		win->base.r.h = (win->base.r.h - (win->bounds.y2 - win->bounds.y) + surfaceHeightGet(win->scroll->area) - 1);

		// Does this go off the screen to the right?
		if (win->base.r.x + win->base.r.w >= videoDisplayWidthGet()) {
			// Can we move it left to fit?
			i = videoDisplayWidthGet() - (win->base.r.x + win->base.r.w);
			if (i <= win->base.r.x) {
				// Yes, go left!
				win->base.r.x += i;
			} else {
				// Nope.  Go all the way left and resize to fit on desktop.
				win->base.r.x = 0;
				win->base.r.w = videoDisplayWidthGet();
			}
		}

		// Does this go off the screen to the bottom?
		if (win->base.r.y + win->base.r.h >= videoDisplayHeightGet()) {
			// Can we move it up to fit?
			i = videoDisplayHeightGet() - (win->base.r.y + win->base.r.h);
			if (i <= win->base.r.y) {
				// Yes, go up!
				win->base.r.y += i;
			} else {
				// Nope.  Go all the way up and resize to fit on desktop.
				win->base.r.y = 0;
				win->base.r.h = videoDisplayHeightGet();
			}
		}

	}  // Maximized?

	// Update.
	widgetDirtySet(W(win), 1);
}


void windowMinimize(WindowT *win) {
	// Minimize.
	win->flags |= WIN_IS_ICON;
	// Find topmost non-minimized window.
	windowFocusSet(NULL);
}


void windowMove(WindowT *w, uint16_t x, uint16_t y) {
	int16_t  dx = x - w->base.r.x;
	int16_t  dy = y - w->base.r.y;

	// This is all because we draw the window at 0,0 in order to cache it.
	// To keep the coordinates correct, we have to adjust them all when
	// the window is moved.

	if (w->title || w->flags & WIN_CLOSE || w->flags & WIN_MAXIMIZE || w->flags & WIN_MINIMIZE) {
		if (w->flags & WIN_CLOSE) {
			w->close.x  += dx;
			w->close.y  += dy;
			w->close.x2 += dx;
			w->close.y2 += dy;
		}

		if (w->flags & WIN_MAXIMIZE) {
			w->maximize.x  += dx;
			w->maximize.y  += dy;
			w->maximize.x2 += dx;
			w->maximize.y2 += dy;
		}

		if (w->flags & WIN_MINIMIZE) {
			w->minimize.x  += dx;
			w->minimize.y  += dy;
			w->minimize.x2 += dx;
			w->minimize.y2 += dy;
		}

		w->titlebar.x  += dx;
		w->titlebar.y  += dy;
		w->titlebar.x2 += dx;
		w->titlebar.y2 += dy;
	}

	if (w->flags & WIN_RESIZE) {
		w->resize1.x  += dx;
		w->resize1.y  += dy;
		w->resize1.x2 += dx;
		w->resize1.y2 += dy;
		w->resize2.x  += dx;
		w->resize2.y  += dy;
		w->resize2.x2 += dx;
		w->resize2.y2 += dy;
	}

	w->bounds.x  += dx;
	w->bounds.y  += dy;
	w->bounds.x2 += dx;
	w->bounds.y2 += dy;

	w->base.r.x = x;
	w->base.r.y = y;
}


static void windowPaint(struct WidgetS *widget, ...) {
	int16_t   x  = 0;
	int16_t   y;
	int16_t   px;
	int16_t   py;
	int16_t   xi;
	int16_t   yi;
	int16_t   xc;
	int16_t   yc;
	WindowT  *w  = (WindowT *)widget;
	va_list   args;
	uint8_t   mode;

	// What paint mode are we in?
	va_start(args, widget);
	mode = va_arg(args, int);
	va_end(args);

	if (mode == WINDOW_PAINT_ICONS) {
		// Are we minimized?
		if (w->flags & WIN_IS_ICON) {
			// Draw iconized version of contents.  There are too many counters here but it's the only way it worked reliably.
			yi = (surfaceHeightGet(w->scroll->area) - 1) / ICON_SIZE;
			xi = (surfaceWidthGet(w->scroll->area) - 1) / ICON_SIZE;
			py = videoDisplayHeightGet() - ICON_SIZE;
			y = 0;
			x = 0;
			for (yc=0; yc<ICON_SIZE; yc++) {
				y += yi;
				px = (ICON_SIZE + 1) * _iconCount;
				for (xc=0; xc<ICON_SIZE; xc++) {
					x += xi;
					surfacePixelSet(px++, py, surfacePixelGet(w->scroll->area, x, y));
				}
				py++;
			}
			_iconCount++;
		}
	} else {  // WINDOW_PAINT_ICONS
		// Are we not minimized?
		if (!(w->flags & WIN_IS_ICON)) {
			// Does the window chrome itself need redrawn?
			if (widgetDirtyGet(widget)) {
				widgetDirtySet(widget, 0);
				x = 1;   // This is a flag for later that we need to update the cached surface.
			}
			// Did a widget or the window chrome need redrawn?
			if (x || widgetChildrenDirty(widget)) windowCache(w, x);
			// By now we have a valid cached window.  Blit it.
			surfaceBlit(w->base.r.x, w->base.r.y, 0, 0, w->base.r.w, w->base.r.h, w->cached);
		}
	}
}


RegisterT *windowRegister(uint8_t magic) {
	static RegisterT reg = {
		"Window",
		NULL,           // Click event is special for windows.
		windowDestroy,  // Destroy.
		windowPaint,    // Paint.
		NULL,           // Unregister.
		windowWidgetFinder
	};

	// One-time widget startup code.
	__MAGIC_WINDOW = magic;

	return &reg;
}


void windowResize(WindowT *win, uint16_t width, uint16_t height) {

	int16_t x       = 0;
	int16_t y       = 0;
	int16_t content = 0;
	PointT  chrome;

	// Find size of window chrome.
	chrome.x = win->base.r.w - (win->bounds.x2 - win->bounds.x) + 1;
	chrome.y = win->base.r.h - (win->bounds.y2 - win->bounds.y) + 1;

	// Too small?
	if (width  < (GADGET_SIZE * 5) + chrome.x) width  = (GADGET_SIZE * 5) + chrome.x;
	if (height < (GADGET_SIZE * 4) + chrome.y) height = (GADGET_SIZE * 4) + chrome.y;

	// Too big?  Horizontal.
	// Width of content area of window.
	content = win->bounds.x2 - win->bounds.x + 1;
	// Do we need to take the height of the vertical scroll bar into account?
	if (win->scroll->scrollv) content -= win->scroll->scrollv->base.r.w;
	// Clamp.
	x = win->base.r.w - content + surfaceWidthGet(win->scroll->area);
	if (width > x) width = x;

	// Too big?  Vertical.
	// Height of content area of window.
	content = win->bounds.y2 - win->bounds.y + 1;
	// Clamp.
	y = win->base.r.h - content + surfaceHeightGet(win->scroll->area);
	if (height > y) height = y;

	// Did the size change?
	if (win->base.r.w != width || win->base.r.h !=height) {
		// Yes!  If we were maximized, clear it - can't restore after resizing.
		win->flags &= ~WIN_IS_MAX;

		// Do resize.
		win->base.r.w = width;
		win->base.r.h =height;
		widgetDirtySet(W(win), 1);
	}
}


static WidgetT *windowWidgetFinder(WidgetT *widget, uint16_t x, uint16_t y, int16_t *localX,  int16_t *localY) {
	int16_t  i;
	PointT   br;
	WidgetT *w;

	// Find window bottom/right bounds.
	br.x = widget->r.x + widget->r.w - 1;
	br.y = widget->r.y + widget->r.h - 1;

	// Are we over the provided window?
	if (x <= br.x && x >= widget->r.x && y <= br.y && y >= widget->r.y) {
		// Widget local mouse position.
		*localX = x - widget->r.x;
		*localY = y - widget->r.y;
		// Find widget under mouse.
		for (i=0; i<arrlen(widget->children); i++) {
			w = widget->children[i];
			if (*localX >= w->r.x && *localX < w->r.x + w->r.w && *localY >= w->r.y && *localY < w->r.y + w->r.h) {
				// Ask this widget who we're pointing at.  Reuse 'br'.
				br.x = *localX;
				br.y = *localY;
				w = w->reg->findWidget(w, br.x, br.y, localX, localY);
				return w;
			}
		}
	}

	// Didn't find a widget.
	return NULL;
}


void wmShutdown(void) {
	uint16_t i;

	// Delete all windows.
	for (i=0; i<arrlen(_windowList); i++) widgetDestroy(W(_windowList[i]));
	arrfree(_windowList);
}


void wmStartup(void) {
	// Nada
}


void wmUpdate(EventT *event) {
	int16_t              i;
	PointT               widgetLocal;
	int16_t              x2;
	int16_t              y2;
	uint8_t              onResize     = 0;
	WidgetT             *widget;
	WidgetT             *widgetOver   = NULL;
	WindowT             *win          = NULL;
	ClickRawInputT       rawEvent     = { 0 };
	static uint8_t       resizing     = 0;
	static PointT        resizeOffset = { 0 };
	static uint8_t       dragging     = 0;
	static PointT        dragOffset   = { 0 };
	static WidgetT      *widgetDown   = NULL;

	// Do we have windows?
	if (arrlen(_windowList) > 0) {

		// Mouse is always the default pointer unless something changes it for this frame.
		guiMousePointerSet(MOUSE_POINTER);

		// Paint all minimized windows.
		surfaceSet(__guiBackBuffer);
		_iconCount = 0;
		for (i=0; i<arrlen(_windowList); i++) {
			widget = (WidgetT *)_windowList[i];
			widget->reg->paint(widget, 0);
		}

		// Paint all windows.
		_iconCount = 0;
		for (i=0; i<arrlen(_windowList); i++) {
			surfaceSet(__guiBackBuffer);
			widget = (WidgetT *)_windowList[i];
			widget->reg->paint(widget, 1);
		}

		// Get top window.
		win = _windowTop;

		// If we found a window, get right/bottom and widget.
		if (win) {
			// Find window outer bounds.
			x2 = win->base.r.x + win->base.r.w - 1;
			y2 = win->base.r.y + win->base.r.h - 1;
			// Are we over a widget?
			widgetOver = windowWidgetFinder(W(win), event->x, event->y, &widgetLocal.x, &widgetLocal.y);
		} else {
			x2 = 0;
			y2 = 0;
			widgetOver = NULL;
		}

		// If we're over a widget that has raw input processing enabled and we haven't started a click on another widget yet, send to target for raw processing.
		if (widgetOver && !widgetDown && !dragging && !resizing && (widgetOver->flags & WIDGET_RAW_INPUT) && (event->buttons != 0)) {
			if (widgetOver->reg->click) {
				rawEvent.event = event;
				rawEvent.data  = widgetOver->data;
				widgetOver->reg->click(widgetOver, widgetLocal.x, widgetLocal.y, CLICK_RAW_INPUT, &rawEvent);
			}
			return;
		}

		// Wrap left button processing with a 'for' so we can 'break' out of it.
		for (;;) {

			// Does the topmost window have a resize?
			if (win && win->flags & WIN_RESIZE) {
				// Are we over the resize of the topmost window?
				if ((event->x <= win->resize1.x2 && event->x >= win->resize1.x && event->y <= win->resize1.y2 && event->y >= win->resize1.y) ||
					(event->x <= win->resize2.x2 && event->x >= win->resize2.x && event->y <= win->resize2.y2 && event->y >= win->resize2.y) ||
					resizing) {
					onResize = 1;
					guiMousePointerSet(MOUSE_RESIZE);
				}
			}

			// Is the left mouse button down?
			if (event->buttons & BUTTON_LEFT) {

				// DEBUG - draw active regions.  Crashes if you minimize.
				/*
				surfaceSet(__guiBackBuffer);
				surfaceBox(win->base.r.x, win->base.r.y, x2, y2, GUI_YELLOW);
				surfaceBox(win->bounds.x, win->bounds.y, win->bounds.x2, win->bounds.y2, GUI_YELLOW);
				surfaceBox(win->close.x, win->close.y, win->close.x2, win->close.y2, GUI_LIGHTBLUE);
				surfaceBox(win->titlebar.x, win->titlebar.y, win->titlebar.x2, win->titlebar.y2, GUI_LIGHTCYAN);
				surfaceBox(win->minimize.x, win->minimize.y, win->minimize.x2, win->minimize.y2, GUI_LIGHTGREEN);
				surfaceBox(win->maximize.x, win->maximize.y, win->maximize.x2, win->maximize.y2, GUI_RED);
				*/
				/*
				surfaceBox(win->scrollv.x, win->scrollv.y, win->scrollv.x2, win->scrollv.y2, GUI_BLUE);
				surfaceBox(win->scrollh.x, win->scrollh.y, win->scrollh.x2, win->scrollh.y2, GUI_BROWN);
				*/

				// Are we currently dragging?
				if (dragging) {

					// Move window to new mouse location.
					windowMove(win, event->x - dragOffset.x, event->y - dragOffset.y);
					break;

				} else { // Dragging.

					if (resizing) {
						// If they try to resize outside the window bounds, cancel it.
						if (event->x < win->base.r.x || event->y < win->base.r.y) break;
						// Resize it.
						windowResize(win, event->x - resizeOffset.x, event->y - resizeOffset.y);
						break;

					} else { // Resizing.

						// Did the button just go down?
						if (event->flags & EVENT_FLAG_LEFT_DOWN) {

							// Are we on the topmost window?
							if (win && event->x <= x2 && event->x >= win->base.r.x && event->y <= y2 && event->y >= win->base.r.y) {

								// Are we on the resizing area?
								if (onResize) {
									resizing = 1;
									resizeOffset.x = event->x - win->base.r.w;
									resizeOffset.y = event->y - win->base.r.h;
									break;
								}

								// Are we over a widget?
								if (widgetOver) {
									if (widgetOver->reg->click) widgetOver->reg->click(widgetOver, widgetLocal.x, widgetLocal.y, CLICK_LEFT_DOWN, widgetOver->data);
									widgetDown = widgetOver;
								}

								// Are we inside the close button?  Does not include button frame on purpose.
								if (win->flags & WIN_CLOSE && event->x < win->close.x2 && event->x > win->close.x && event->y < win->close.y2 && event->y > win->close.y) {
									//***TODO*** Close.
								}

								// Are we inside the title bar to begin dragging?  Does not include titlebar frame on purpose.
								if (event->x < win->titlebar.x2 && event->x > win->titlebar.x && event->y < win->titlebar.y2 && event->y > win->titlebar.y) {
									dragging = 1;
									dragOffset.x = event->x - win->base.r.x;
									dragOffset.y = event->y - win->base.r.y;
									break;
								}

								// Are we inside the minimize button?  Does not include button frame on purpose.
								if (win->flags & WIN_MINIMIZE &&event->x < win->minimize.x2 && event->x > win->minimize.x && event->y < win->minimize.y2 && event->y > win->minimize.y) {
									windowMinimize(win);
									break;
								}

								// Are we inside the maximize button?  Does not include button frame on purpose.
								if (win->flags & WIN_MAXIMIZE &&event->x < win->maximize.x2 && event->x > win->maximize.x && event->y < win->maximize.y2 && event->y > win->maximize.y) {
									windowMaximizeRestore(win);
									break;
								}

							} else { // On topmost window.

								// Not over topmost window.  Search backwards to find first window we're inside.
								i = arrlen(_windowList) - 1;
								if (i >= 0) {
									for (; i>=0; i--) {
										win = _windowList[i];
										// Is this the current window?
										if (win == _windowTop) continue;
										// Is this window minimized?
										if (win->flags & WIN_IS_ICON) continue;
										// Get right/bottom of window.
										x2 = win->base.r.x + win->base.r.w - 1;
										y2 = win->base.r.y + win->base.r.h - 1;
										// Inside this window?
										if (event->x <= x2 && event->x >= win->base.r.x && event->y <= y2 && event->y >= win->base.r.y) {
											// Bring this window forward.
											windowFocusSet(win);
											// If we happened to be in the title bar, go ahead and start dragging.  Does not include titlebar frame on purpose.
											if (event->x < win->titlebar.x2 && event->x > win->titlebar.x && event->y < win->titlebar.y2 && event->y > win->titlebar.y) {
												dragging = 1;
												dragOffset.x = event->x - win->base.r.x;
												dragOffset.y = event->y - win->base.r.y;
											}
											break;
										}
									}
								}

							} // On topmost window.

							// Do we have minimized windows?
							if (_iconCount > 0) {
								// Are we inside the minimized icons area?
								if (event->x < (ICON_SIZE + 1) * _iconCount && event->y >= videoDisplayHeightGet() - ICON_SIZE) {
									// Figure out which icon we're over.
									x2 = 0;
									for (i=0; i<arrlen(_windowList); i++) {
										if (_windowList[i]->flags & WIN_IS_ICON) {
											x2 += ICON_SIZE;
											// This window?
											if (event->x < x2) {
												// Restore it and stop looking for icons.
												_windowList[i]->flags &= ~WIN_IS_ICON;
												windowFocusSet(_windowList[i]);
												break;
											}
											// Next!  (Skips pixel between icons.)
											x2++;
										}
									}
								} // Minimized windows?
							}

						} else {  // Button just went down / button being held down.

							// Nada

						} // Left button held down.

					}  // Resizing.

				} // Dragging.

			} else {  // Left mouse button.

				// Left mouse not down.

				// Can no longer be dragging.
				dragging = 0;

				// Can no longer be resizing.
				resizing = 0;

				// Did the left button just come up?
				if (event->flags & EVENT_FLAG_LEFT_UP) {

					// Did this click begin over a widget?
					if (widgetDown) {
						// Are we still inside the window content?
						if (event->x <= win->bounds.x2 && event->x >= win->bounds.x && event->y <= win->bounds.y2 && event->y >= win->bounds.y) {
							// Are we stll over the same widget?
							widget = windowWidgetFinder(W(win), event->x, event->y, &widgetLocal.x, &widgetLocal.y);
							// Send to widget for processing or send cancel.
							if (widgetDown->reg->click) widgetDown->reg->click(widgetDown, widgetLocal.x, widgetLocal.y, (widget == widgetDown) ? CLICK_LEFT_UP : CLICK_LEFT_CANCEL, widgetDown->data);
						}
						widgetDown = NULL;
					}  // widgetDown

				}
			}

			break;
		} // Left button processing.

	} // Do we have windows?
}


WindowT *wmWindowOnTopGet(void) {
	return _windowTop;
}