flowpanel.java

最强手机阅读器Anyview3.0版的界面代码

package com.ismyway.fairyui;

import javax.microedition.lcdui.Graphics;

import com.ismyway.anyview.others.Settings;


public class FlowPanel extends Panel {
	private int maxHeight = 100;

	public FlowPanel() {
		setBorder(true);
	}

	public FlowPanel(Callback callback) {
		super(callback);
		setBorder(true);
	}

	public void paint(Graphics g, int adjustx, int adjusty) {
		g.setClip(getLeft(), getTop(), mainCanvas.getWidth(), getHeight());
		g.setColor(bgColor);
		int filly = getTop() - adjusty;
		filly = filly < 0 ? 0 : filly;
		int fillh = getTop() + getHeight() - filly - adjusty;
		fillh = fillh > mainCanvas.getHeight() ? mainCanvas.getHeight() : fillh;
		g.fillRect(getLeft() - adjustx, filly, getWidth(), fillh);
//		System.out.println(filly + ", " + fillh);

		//绘制滚动条
		if (showscrollbar) {
			drawScrollbar(g, adjustx, adjusty);
		}

		for (int i = 0; i < components.size(); ++i) {
			Row row = (Row) components.get(i);
			//System.out.println(row.getClass().getName());			
			if (row.getTop() + row.getHeight() < getTop() + adjusty) {
				continue;
			}
			if (row.getTop() > getTop() + viewportHeight + adjusty) {
				break;
			}
			row.setFilledColor(bgColor);
			row.paint(g, adjustx, adjusty);
		}

		paintTitleBottom(g, adjustx, adjusty);
		restoreClip(g);
	}

	synchronized public void validate() {
		//onActive();

		int width = mainCanvas.getWidth();
		viewportHeight = maxHeight;
		//System.out.println("viewportHeight = " + viewportHeight + "/" + control.getHeight());
		showscrollbar = false;
		internalHeight = getTopHeight();
		verticalOffset = 0;

		//首先，假设不需要滚动条
		int top = getTop() + getTopHeight();
		for (int i = 0; i < components.size(); ++i) {
			Component c = (Component) components.get(i);
			c.setTop(top);
			c.setWidth(width);
			c.validate();
			internalHeight += c.getHeight();
			top += c.getHeight();
			if (internalHeight > viewportHeight) { //需要滚动条
				this.showscrollbar = true;
				break;
			}
		}

		internalHeight += getBottomHeight();
		if (internalHeight > viewportHeight) { //需要滚动条
			this.showscrollbar = true;
		}

		if (!showscrollbar) {
			setWidth(width);
			setHeight(internalHeight);
			resetPointer();
			return;
		}

		//需要滚动条，重新计算
		showscrollbar = true;
		internalHeight = 0;
		width -= Settings.SCROLLBAR_WIDTH;
		top = getTop() + getTopHeight();
		for (int i = 0; i < components.size(); ++i) {
			Component c = (Component) components.get(i);
			c.setTop(top);
			c.setWidth(width);
			c.validate();
			internalHeight += c.getHeight();
			top += c.getHeight();
		}
		internalHeight += getBottomHeight();
		setWidth(width);
		scrollbarHeight = viewportHeight * viewportHeight / internalHeight;
		scrollbarHeight = scrollbarHeight < 16 ? 16 : scrollbarHeight;
		setHeight(viewportHeight);

		resetPointer();
	}

	public int getMaxHeight() {
		return maxHeight;
	}

	public void setMaxHeight(int maxHeight) {
		this.maxHeight = maxHeight;
	}

	public void setSelectPointer(int index) {
		if (hotpots.size() < 1 || currentPointer == index || index < 0
				|| index > hotpots.size() - 1) {
			return;
		}
		((Component) hotpots.get(index)).setSelected(true);
		((Component) hotpots.get(currentPointer)).setSelected(false);
		currentPointer = index;
	}
}