Go GUI---lxn/walk 自带demo学习---14.logview

最新推荐文章于 2023-02-26 21:11:28 发布

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最新推荐文章于 2023-02-26 21:11:28 发布 · 512 阅读

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CC 4.0 BY-SA版权

该博客介绍了一个用Go编写的LogView组件，它是一个用于显示和追加文本的日志视图。LogView实现了在GUI中实时追加文本的功能，支持设置只读模式，并且能够处理来自消息队列的文本追加请求。通过使用win32 API，LogView可以方便地集成到Windows应用中，提供日志记录和查看的能力。

logview.go

// Copyright 2012 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main

import (
	"errors"
	"syscall"
	"unsafe"
)

import (
	"github.com/lxn/walk"
	"github.com/lxn/win"
)

type LogView struct {
	walk.WidgetBase
	logChan chan string
}

const (
	TEM_APPENDTEXT = win.WM_USER + 6
)

func NewLogView(parent walk.Container) (*LogView, error) {
	lc := make(chan string, 1024)
	lv := &LogView{logChan: lc}

	if err := walk.InitWidget(
		lv,
		parent,
		"EDIT",
		win.WS_TABSTOP|win.WS_VISIBLE|win.WS_VSCROLL|win.ES_MULTILINE|win.ES_WANTRETURN,
		win.WS_EX_CLIENTEDGE); err != nil {
		return nil, err
	}
	lv.setReadOnly(true)
	lv.SendMessage(win.EM_SETLIMITTEXT, 4294967295, 0)
	return lv, nil
}

func (*LogView) CreateLayoutItem(ctx *walk.LayoutContext) walk.LayoutItem {
	return walk.NewGreedyLayoutItem()
}

func (lv *LogView) setTextSelection(star