// // WorldLayout manager class // part of the set of documents known as Java no sugar. // Copyright (c) 1996 Sunil Gupta, sunil@magnetic.demon.co.uk // placed into the public domain. // // // Layout managers can't rely upon minimumSize() to return anything // sensible // import java.awt.*; import java.util.*; import WorldConstraints; public class WorldLayout implements LayoutManager { private Hashtable constraint_table; private Dimension original_size = null; //************************************************************** // Constructors //************************************************************** public WorldLayout(int width, int height) { this(); original_size = new Dimension(width,height); } public WorldLayout() { constraint_table = new Hashtable(); } //************************************************************** // constraints //************************************************************** protected WorldConstraints lookupConstraints(Component comp) { return ( this.getConstraints(comp) ); } public WorldConstraints getConstraints(Component comp) { return ( (WorldConstraints) constraint_table.get(comp) ); } public void setConstraints(Component comp, WorldConstraints constraints) { constraint_table.put(comp, constraints); } //************************************************************** // unwanted methods defined by LayoutManager interface //************************************************************** public void addLayoutComponent(String name,Component comp) { } //************************************************************** // methods defined by LayoutManager interface //************************************************************** public void layoutContainer(Container target) { Component component; int n_components, index, new_width, new_height; WorldConstraints constraint; Dimension container_size, component_size, min_component_size; double x,y, x_ratio, y_ratio; boolean first_time = true; //------------- resize each component to the size of the container-------- container_size = target.size(); // ------- if the original size is known, a resize hapened so adjust ratios if (original_size != null) { x_ratio = (double)container_size.width / (double)original_size.width; y_ratio = (double)container_size.height / (double)original_size.height; } else { x_ratio = 1.0; y_ratio = 1.0; } //------------- resize each component to the size of the container-------- n_components = target.countComponents(); for (index =0; index < n_components; index ++) { //- - - - - -get component and constraint - - - - - - - - - component = target.getComponent(index); constraint = (WorldConstraints)this.getConstraints(component); if (constraint == null) constraint = new WorldConstraints(); //- - - - get component sizes- - - - - - - - - - - - - - - - - - component_size = component.preferredSize(); min_component_size = component.minimumSize(); //- - - -resize, observing minimum component size - - - - - - if ( constraint.resizeX ) { if (constraint.override_width) new_width = (int) Math.round( (double)container_size.width * constraint.width /100.0 ); else new_width = (int) Math.round( (double)component_size.width * x_ratio); component_size.width = Math.max(new_width,min_component_size.width); } if ( constraint.resizeY ) { if (constraint.override_height) new_height = (int) Math.round( (double)container_size.height * constraint.height/100.0); else new_height = (int) Math.round( (double)component_size.height * y_ratio); component_size.height = Math.max(new_height,min_component_size.height); } component.resize(component_size.width, component_size.height); //- - - - - -move proportional to container size- - - - - - - x = (double) container_size.width * constraint.x / 100.0; y = (double) container_size.height * constraint.y / 100.0; component.move( (int)Math.round(x), (int)Math.round(y) ); } //------------remember original size for next time------------ if (original_size == null) { original_size = container_size; first_time = false; } } public Dimension minimumLayoutSize(Container target) { return (original_size); } public Dimension preferredLayoutSize(Container target) { return (original_size); } public void removeLayoutComponent(Component comp) { constraint_table.remove(comp); } public String toString() { return ( getClass().getName() + ": from Java no sugar") ; } }
file: /Techref/language/java/nosugar/custom/world/code/WorldLayout.java, 5KB, , updated: 1997/1/11 22:32, local time: 2024/8/26 10:18,
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