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Improve and reorganize Fl_Tile's documentation and test/tile demo.

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Moved docs from header file and enhanced docs, particularly about the
resizable() widget and the resize behavior in general.

Changed the tile demo program to use a resizable() with 20 pixels
border distance, so that border dragging is limited as described in the
docs. Updated the image file to reflect the current test/tile.cxx demo.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10385 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Albrecht Schlosser 2014-10-19 14:17:47 +00:00
parent 157c5bf15e
commit 25cf93b4cb
4 changed files with 137 additions and 91 deletions
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64
FL/Fl_Tile.H
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@ -3,10 +3,10 @@
//
// Tile header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
// Copyright 1998-2014 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
@ -16,71 +16,19 @@
// http://www.fltk.org/str.php
//
/* \file
Fl_Tile widget . */
#ifndef Fl_Tile_H
#define Fl_Tile_H
#include "Fl_Group.H"
/**
The Fl_Tile class lets you resize the children by dragging
the border between them:
<P ALIGN=CENTER>\image html Fl_Tile.png </P>
\image latex Fl_Tile.png "Fl_Tile" width=4cm
<P>For the tiling to work correctly, the children of an
Fl_Tile must cover the entire area of the widget, but not
overlap. This means that all children must touch each
other at their edges, and no gaps can't be left inside the
Fl_Tile.
<P>Fl_Tile does not normailly draw any graphics of its own.
The "borders" which can be seen in the snapshot above
are actually part of the children. Their boxtypes have been set
to FL_DOWN_BOX creating the impression of
"ridges" where the boxes touch. What you see are
actually two adjacent FL_DOWN_BOX's drawn next to each
other. All neighboring widgets share the same edge - the widget's
thick borders make it appear as though the widgets aren't actually
touching, but they are. If the edges of adjacent widgets do not
touch, then it will be impossible to drag the corresponding
edges.</P>
<P>Fl_Tile allows objects to be resized to zero dimensions.
To prevent this you can use the resizable() to limit where
corners can be dragged to.</P>
<P>Even though objects can be resized to zero sizes, they must
initially have non-zero sizes so the Fl_Tile can figure out
their layout. If desired, call position() after creating the
children but before displaying the window to set the borders where you
want.
<P>Note on resizable(Fl_Widget &w) :
The "resizable" child widget (which should be invisible) limits where the
border can be dragged to. If you don't set it, it will be possible to
drag the borders right to the edge, and thus resize objects on the edge
to zero width or height. The resizable() widget is not
resized by dragging any borders. See also void Fl_Group::resizable(Fl_Widget &w)
/*
The Fl_Tile class lets you resize its children by dragging
the border between them.
*/
class FL_EXPORT Fl_Tile : public Fl_Group {
public:
int handle(int);
/**
Creates a new Fl_Tile widget using the given position, size,
and label string. The default boxtype is FL_NO_BOX.
<P>The destructor <I>also deletes all the children</I>. This allows a
whole tree to be deleted at once, without having to keep a pointer to
all the children in the user code. A kludge has been done so the
Fl_Tile and all of it's children can be automatic (local)
variables, but you must declare the Fl_Tile <I>first</I>, so
that it is destroyed last.
*/
Fl_Tile(int X,int Y,int W,int H,const char*l=0);
void resize(int, int, int, int);
void position(int, int, int, int);

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134
src/Fl_Tile.cxx
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@ -3,10 +3,10 @@
//
// Tile widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
// Copyright 1998-2014 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
@ -16,23 +16,81 @@
// http://www.fltk.org/str.php
//
/**
\class Fl_Tile
// Group of 2 or 4 "tiles" that can be resized by dragging border
// The size of the first child determines where the resize border is.
// The resizebox is used to limit where the border can be dragged to.
The Fl_Tile class lets you resize its children by dragging
the border between them.
\image html Fl_Tile.png
\image latex Fl_Tile.png "Fl_Tile" width=5cm
For the tiling to work correctly, the children of an Fl_Tile must
cover the entire area of the widget, but not overlap.
This means that all children must touch each other at their edges,
and no gaps can be left inside the Fl_Tile.
Fl_Tile does not normally draw any graphics of its own.
The "borders" which can be seen in the snapshot above are actually
part of the children. Their boxtypes have been set to FL_DOWN_BOX
creating the impression of "ridges" where the boxes touch. What
you see are actually two adjacent FL_DOWN_BOX's drawn next to each
other. All neighboring widgets share the same edge - the widget's
thick borders make it appear as though the widgets aren't actually
touching, but they are. If the edges of adjacent widgets do not
touch, then it will be impossible to drag the corresponding edges.
Fl_Tile allows objects to be resized to zero dimensions.
To prevent this you can use the resizable() to limit where
corners can be dragged to. For more information see note below.
Even though objects can be resized to zero sizes, they must initially
have non-zero sizes so the Fl_Tile can figure out their layout.
If desired, call position() after creating the children but before
displaying the window to set the borders where you want.
<b>Note on resizable(Fl_Widget &w):</b>
The "resizable" child widget (which should be invisible) limits where
the borders can be dragged to. All dragging will be limited inside the
resizable widget's borders. If you don't set it, it will be possible
to drag the borders right to the edges of the Fl_Tile widget, and thus
resize objects on the edges to zero width or height. When the entire
Fl_Tile widget is resized, the resizable() widget will keep its border
distance to all borders the same (this is normal resize behavior), so
that you can effectively set a border width that will never change.
<b>Note:</b>
You can still resize widgets \b inside the resizable() to zero width and/or
height, i.e. box \b 2b above to zero width and box \b 3a to zero height.
\see void Fl_Group::resizable(Fl_Widget &w)
Example for resizable with 20 pixel border distance:
\code
int dx = 20, dy = dx;
Fl_Tile tile(50,50,300,300);
// ... create widgets inside tile (see test/tile.cxx) ...
// create resizable() box
Fl_Box r(tile.x()+dx,tile.y()+dy,tile.w()-2*dx,tile.h()-2*dy);
tile.resizable(r);
tile.end();
\endcode
See also the complete example program in test/tile.cxx.
*/
#include <FL/Fl.H>
#include <FL/Fl_Tile.H>
#include <FL/Fl_Window.H>
#include <stdlib.h>
// Drag the edges that were initially at oldx,oldy to newx,newy:
// pass zero as oldx or oldy to disable drag in that direction:
/**
Drag the intersection at from_x,from_y to to_x,to_y.
Drags the intersection at (\p oldx,\p oldy) to (\p newx,\p newy).
This redraws all the necessary children.
Pass zero as \p oldx or \p oldy to disable drag in that direction.
*/
void Fl_Tile::position(int oix, int oiy, int newx, int newy) {
void Fl_Tile::position(int oldx, int oldy, int newx, int newy) {
Fl_Widget*const* a = array();
int *p = sizes();
p += 8; // skip group & resizable's saved size
@ -41,28 +99,43 @@ void Fl_Tile::position(int oix, int oiy, int newx, int newy) {
if (o == resizable()) continue;
int X = o->x();
int R = X+o->w();
if (oix) {
if (oldx) {
int t = p[0];
if (t == oix || (t>oix && X<newx) || (t<oix && X>newx) ) X = newx;
if (t == oldx || (t>oldx && X<newx) || (t<oldx && X>newx) ) X = newx;
t = p[1];
if (t == oix || (t>oix && R<newx) || (t<oix && R>newx) ) R = newx;
if (t == oldx || (t>oldx && R<newx) || (t<oldx && R>newx) ) R = newx;
}
int Y = o->y();
int B = Y+o->h();
if (oiy) {
if (oldy) {
int t = p[2];
if (t == oiy || (t>oiy && Y<newy) || (t<oiy && Y>newy) ) Y = newy;
if (t == oldy || (t>oldy && Y<newy) || (t<oldy && Y>newy) ) Y = newy;
t = p[3];
if (t == oiy || (t>oiy && B<newy) || (t<oiy && B>newy) ) B = newy;
if (t == oldy || (t>oldy && B<newy) || (t<oldy && B>newy) ) B = newy;
}
o->damage_resize(X,Y,R-X,B-Y);
}
}
// move the lower-right corner (sort of):
/**
Resizes the Fl_Tile widget and its children.
Fl_Tile implements its own resize() method. It does not use
Fl_Group::resize() to resize itself and its children.
Enlarging works by just moving the lower-right corner and resizing
the bottom and right border widgets accordingly.
Shrinking the Fl_Tile works in the opposite way by shrinking
the bottom and right border widgets, unless they are reduced to zero
width or height, resp. or to their minimal sizes defined by the
resizable() widget. In this case other widgets will be shrunk as well.
See the Fl_Tile class documentation about how the resizable() works.
*/
void Fl_Tile::resize(int X,int Y,int W,int H) {
//Fl_Group::resize(X, Y, W, H);
//return;
// remember how much to move the child widgets:
int dx = X-x();
int dy = Y-y();
@ -71,11 +144,13 @@ void Fl_Tile::resize(int X,int Y,int W,int H) {
int *p = sizes();
// resize this (skip the Fl_Group resize):
Fl_Widget::resize(X,Y,W,H);
// find bottom-right of resiable:
int OR = p[5];
int NR = X+W-(p[1]-OR);
int OB = p[7];
int NB = Y+H-(p[3]-OB);
// find bottom-right corner of resizable:
int OR = p[5]; // old right border
int NR = X+W-(p[1]-OR); // new right border
int OB = p[7]; // old bottom border
int NB = Y+H-(p[3]-OB); // new bottom border
// move everything to be on correct side of new resizable:
Fl_Widget*const* a = array();
p += 8;
@ -200,6 +275,19 @@ int Fl_Tile::handle(int event) {
return Fl_Group::handle(event);
}
/**
Creates a new Fl_Tile widget using the given position, size,
and label string. The default boxtype is FL_NO_BOX.
The destructor <I>also deletes all the children</I>. This allows a
whole tree to be deleted at once, without having to keep a pointer to
all the children in the user code. A kludge has been done so the
Fl_Tile and all of its children can be automatic (local)
variables, but you must declare the Fl_Tile <I>first</I>, so
that it is destroyed last.
\see class Fl_Group
*/
Fl_Tile::Fl_Tile(int X,int Y,int W,int H,const char*l)
: Fl_Group(X,Y,W,H,l)

18
test/tile.cxx
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@ -3,7 +3,7 @@
//
// Tile test program for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
// Copyright 1998-2014 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
@ -27,19 +27,23 @@ int main(int argc, char** argv) {
Fl_Double_Window window(300,300);
window.box(FL_NO_BOX);
window.resizable(window);
int dx = 20, dy = dx; // border width of resizable() - see below
Fl_Tile tile(0,0,300,300);
Fl_Box box0(0,0,150,150,"0");
box0.box(FL_DOWN_BOX);
box0.color(9);
box0.labelsize(36);
box0.align(FL_ALIGN_CLIP);
Fl_Double_Window w1(150,0,150,150,"1");
w1.box(FL_NO_BOX);
Fl_Box box1(0,0,150,150,"1\nThis is a\nchild\nwindow");
Fl_Box box1(0,0,150,150,"1\nThis is a child window");
box1.box(FL_DOWN_BOX);
box1.color(19);
box1.labelsize(18);
box1.align(FL_ALIGN_CLIP);
box1.align(FL_ALIGN_CLIP|FL_ALIGN_INSIDE|FL_ALIGN_WRAP);
w1.resizable(box1);
w1.end();
@ -49,6 +53,7 @@ int main(int argc, char** argv) {
box2a.color(12);
box2a.labelsize(36);
box2a.align(FL_ALIGN_CLIP);
Fl_Box box2b(70,150,80,150,"2b");
box2b.box(FL_DOWN_BOX);
box2b.color(13);
@ -62,6 +67,7 @@ int main(int argc, char** argv) {
box3a.color(12);
box3a.labelsize(36);
box3a.align(FL_ALIGN_CLIP);
Fl_Box box3b(150,150+70,150,80,"3b");
box3b.box(FL_DOWN_BOX);
box3b.color(13);
@ -69,15 +75,19 @@ int main(int argc, char** argv) {
box3b.align(FL_ALIGN_CLIP);
//tile3.end();
Fl_Box r(10,0,300-10,300-10);
// create the symmetrical resize box with dx and dy pixels distance, resp.
// from the borders of the Fl_Tile widget
Fl_Box r(tile.x()+dx,tile.y()+dy,tile.w()-2*dx,tile.h()-2*dy);
tile.resizable(r);
// r.box(FL_BORDER_FRAME);
tile.end();
window.end();
#ifdef TEST_INACTIVE // test inactive case
tile.deactivate();
#endif
w1.show();
window.show(argc,argv);
return Fl::run();