一、UI布局
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QFileDialog>
#include <QTreeWidgetItem>
#include <QTreeWidget>
#include <QPixmap>
#include <QLabel>
QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
private:
enum treeItemType {
itTopItem=1001,itGroupItem,itImageItem};
enum treeColNum {
colItem=0,colItemType=1};
QPixmap pixmap;
QLabel labFileName;
float pixRatio;
void changeItemCaption(QTreeWidgetItem *item);
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_actOpenFolder_triggered();
void on_actOpenFile_triggered();
void on_treeWidget_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);
void on_actWidth_triggered();
void on_actIter_triggered();
void on_actDel_triggered();
void on_actHeight_triggered();
void on_actZoomIn_triggered();
void on_actZoomOut_triggered();
void on_actRealSize_triggered();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->statusbar->addWidget(&labFileName);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actOpenFolder_triggered()
{
QString fullname = QFileDialog::getExistingDirectory(this,"open Folder",".");
if(fullname.isEmpty()) return;
QString dir = fullname.right(fullname.length()-fullname.lastIndexOf('/')-1);
if(!ui->treeWidget->currentIndex().isValid()) return;
QTreeWidgetItem* parItem = ui->treeWidget->currentItem();
QTreeWidgetItem* item = new QTreeWidgetItem(itGroupItem);
QIcon icon(":/images/icon/open.ico");
item->setIcon(treeColNum::colItem, icon);
item->setText(treeColNum::colItem, dir);
item->setText(treeColNum::colItemType, "type:group");
item->setFlags(Qt::ItemIsSelectable|Qt::ItemIsAutoTristate|Qt::ItemIsEnabled|Qt::ItemIsUserCheckable);
item->setCheckState(colItem,Qt::Checked);
parItem->addChild(item);
}
void MainWindow::on_actOpenFile_triggered()
{
QStringList files = QFileDialog::getOpenFileNames(this,"file or files",".","Images(*.jpg *.png)");
if (files.isEmpty()) return;
QTreeWidgetItem* parItem;
QTreeWidgetItem* item = ui->treeWidget->currentItem();
if(item->type() == treeItemType::itImageItem)
parItem = item->parent();
else
parItem = item;
foreach(auto &file, files){
item = new QTreeWidgetItem(treeItemType::itImageItem);
QString name = file.right(file.length()-file.lastIndexOf('/')-1);
QIcon icon(":/images/icon/picture.ico");
item->setIcon(treeColNum::colItem, icon);
item->setText(treeColNum::colItem, name);
item->setText(treeColNum::colItemType, "type:Image");
item->setFlags(Qt::ItemIsSelectable|Qt::ItemIsAutoTristate|Qt::ItemIsEnabled|Qt::ItemIsUserCheckable);
item->setCheckState(colItem,Qt::Checked);
item->setData(treeColNum::colItem,Qt::UserRole,file);
parItem->addChild(item);
}
}
void MainWindow::on_treeWidget_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
{
Q_UNUSED(previous);
if(current == NULL) return;
int var = current->type();
switch (var) {
case treeItemType::itTopItem:
ui->actOpenFile->setEnabled(true);
ui->actOpenFolder->setEnabled(true);
ui->actDel->setEnabled(false);
break;
case treeItemType::itGroupItem:
ui->actOpenFile->setEnabled(true);
ui->actOpenFolder->setEnabled(true);
ui->actDel->setEnabled(true);
break;
case treeItemType::itImageItem:
ui->actOpenFile->setEnabled(true);
ui->actOpenFolder->setEnabled(false);
ui->actDel->setEnabled(true);
labFileName.setText(current->data(colItem,Qt::UserRole).toString());
pixmap.load(current->data(colItem,Qt::UserRole).toString());
on_actWidth_triggered();
ui->actWidth->setEnabled(true);
ui->actHeight->setEnabled(true);
ui->actZoomIn->setEnabled(true);
ui->actZoomOut->setEnabled(true);
ui->actRealSize->setEnabled(true);
break;
}
}
void MainWindow::on_actWidth_triggered()
{
int W = ui->scrollArea->width();
int realW = pixmap.width();
pixRatio = (float)W/realW;
QPixmap pix = pixmap.scaledToWidth(W-30);
ui->label->setPixmap(pix);
}
void MainWindow::on_actIter_triggered()
{
for (int i=0; i<ui->treeWidget->topLevelItemCount(); i++) {
QTreeWidgetItem *item = ui->treeWidget->topLevelItem(i);
changeItemCaption(item);
}
}
void MainWindow::changeItemCaption(QTreeWidgetItem *item)
{
QString str = "x_"+item->text(colItem);
item->setText(colItem,str);
for (int i=0; i<item->childCount(); i++) {
changeItemCaption(item->child(i));
}
}
void MainWindow::on_actDel_triggered()
{
QTreeWidgetItem* item = ui->treeWidget->currentItem();
if (!item->parent()) {
ui->actDel->setEnabled(false);
return;
}
QTreeWidgetItem* ParItem = item->parent();
ParItem->removeChild(item);
delete item;
}
void MainWindow::on_actHeight_triggered()
{
int H = ui->scrollArea->height();
int realH = pixmap.height();
pixRatio = (float)H/realH;
QPixmap pix = pixmap.scaledToHeight(H-30);
ui->label->setPixmap(pix);
}
void MainWindow::on_actZoomIn_triggered()
{
pixRatio *= 1.2;
int w = pixRatio*pixmap.width();
int h = pixRatio*pixmap.height();
QPixmap pix = pixmap.scaled(w,h);
ui->label->setPixmap(pix);
}
void MainWindow::on_actZoomOut_triggered()
{
pixRatio *= 0.8;
int w = pixRatio*pixmap.width();
int h = pixRatio*pixmap.height();
QPixmap pix = pixmap.scaled(w,h);
ui->label->setPixmap(pix);
}
void MainWindow::on_actRealSize_triggered()
{
ui->label->setPixmap(pixmap);
}
二、效果演示
