ModulesFragmentMgr.java
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package com.polysoft.nafmii.fragment.home;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import com.polysoft.nafmii.bean.MenuBean;
import com.polysoft.nafmii.enums.ModulesEnum;
import com.polysoft.nafmii.fragment.HomeWebviewFragment;
import com.polysoft.nafmii.fragment.WebViewFragment;
import com.polysoft.nafmii.webview.IWebview;
import java.util.List;
public class ModulesFragmentMgr implements FragmentManager.OnBackStackChangedListener {
private final FragmentManager manager;
private final int containerId;
private final ModuleUrlHandle moduleHandle;
private ModulesEnum currentModule;
private OnChangeModuleListener changeListener;
public ModulesFragmentMgr(FragmentActivity activity, int containerId) {
this.manager = activity.getSupportFragmentManager();
this.containerId = containerId;
this.moduleHandle = new ModuleUrlHandle(activity);
this.manager.addOnBackStackChangedListener(this);
}
public void addChangeModuleLsitener(OnChangeModuleListener listener) {
this.changeListener = listener;
}
public void showInitFragment(ModulesEnum[] modules) {
for (ModulesEnum module : modules) {
this.findNewModuleFragment(module);
}
this.showModule(modules[0]);
}
public WebViewFragment getCurrentFragment() {
if (null == this.currentModule) return null;
return this.findFragment(this.currentModule);
}
public boolean onBackStack() {
WebViewFragment fragment = this.getCurrentFragment();
if (null == fragment) {
return false;
}
IWebview webview = fragment.getWebview();
if (null != webview && webview.canGoBack()) {
return false;
}
if (this.manager.getBackStackEntryCount() > 0) {
this.manager.popBackStack();
return false;
}
return true;
}
@Override
public void onBackStackChanged() {
List<Fragment> fragments = this.manager.getFragments();
for (int i = 0; i < fragments.size(); i++) {
Fragment fragment = fragments.get(i);
if (fragment.isVisible()) {
this.setCurrentModule(ModulesEnum.findModule(fragment.getTag()));
return;
}
}
}
public void showModule(ModulesEnum module) {
if (module == this.currentModule) {
return;
}
if (null == this.currentModule) {
this.showModuleFragment(this.findFragment(module));
this.setCurrentModule(module);
return;
}
this.showModule(this.moduleHandle.getModuleHandle(module));
}
public void showModule(MenuBean bean) {
this.showModule(moduleHandle.getModuleHandle(bean));
}
public WebViewFragment findFragment(ModulesEnum module) {
return (WebViewFragment) this.manager.findFragmentByTag(module.fmtKey);
}
private void showModule(ModuleUrlHandle.IModuleHandle handle) {
ModulesEnum module = handle.getModule();
WebViewFragment fragment = this.findNewModuleFragment(module);
if (!module.fmtKey.equals(this.currentModule.fmtKey)) {
this.showModuleFragment(fragment);
if (null != fragment) {
handle.loadUrl(fragment.getWebview());
}
} else {
handle.loadUrl(fragment.getWebview());
}
this.setCurrentModule(module);
}
private WebViewFragment findNewModuleFragment(ModulesEnum module) {
WebViewFragment fragment = this.findFragment(module);
if (null == fragment) {
FragmentTransaction transaction = this.manager.beginTransaction();
fragment = HomeWebviewFragment.newInstance(this.moduleHandle.getModuleUrl(module));
transaction.add(this.containerId, fragment, module.fmtKey).hide(fragment).commitNow();
}
return fragment;
}
private void showModuleFragment(Fragment fragment) {
if (null == fragment) return;
FragmentTransaction transaction = this.manager.beginTransaction();
WebViewFragment currentFragment = this.getCurrentFragment();
if (null != currentFragment) {
transaction.hide(currentFragment);
}
transaction.show(fragment).commit();
}
private void setCurrentModule(ModulesEnum module) {
this.currentModule = module;
if (null != this.changeListener) {
WebViewFragment fragment = this.getCurrentFragment();
this.changeListener.changeModule(module, fragment);
}
}
public interface OnChangeModuleListener {
void changeModule(ModulesEnum module, Fragment fragment);
}
}