GacUI添加了一個(gè)新的Demo。這個(gè)Demo用了幾個(gè)按鈕（之所以不用菜單是因?yàn)椴幌胱孌emo一下子包含太多新東西）來(lái)實(shí)現(xiàn)剪貼板操作、只讀控制和行跳轉(zhuǎn)等功能。在剪貼板里面的內(nèi)容是文字的時(shí)候，Paste按鈕會(huì)被Enable。這個(gè)過(guò)程是自動(dòng)的，也就是說(shuō)，你在畫(huà)圖里面復(fù)制了一個(gè)圖片，這個(gè)按鈕也會(huì)變灰。Cut和Copy按鈕僅在文本框有文字被選中的時(shí)候可用，因此相應(yīng)了文本框的SelectionChanged來(lái)處理這件事情。如果文本框的內(nèi)容太多的話，{VS, Explorer} X {Debug, Release}這四種運(yùn)行方法里面，只有在Debug模式下掛了VS這種情況會(huì)感覺(jué)有點(diǎn)卡，其他的打開(kāi)方法都是很流暢的。先來(lái)看圖：
代碼還是比較簡(jiǎn)單的。先用一個(gè)Table分成三行，前兩行讓行高縮短到最短，最后一行則利用了剩余空間的100%撐開(kāi)。前兩行里面的按鈕用Stack來(lái)對(duì)它們進(jìn)行排版。單行文本框沒(méi)有最小高度，所以依靠Stack和Table，它的高度會(huì)保持跟按鈕一致。代碼如下：
1 #include "..\..\Public\Source\GacUIIncludes.h"
2 #include <Windows.h>
3
4 int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int CmdShow)
5 {
6 return SetupWindowsDirect2DRenderer();
7 }
8
9 class TextBoxEditorWindow : public GuiWindow
10 {
11 private:
12 GuiButton* buttonCut;
13 GuiButton* buttonCopy;
14 GuiButton* buttonPaste;
15 GuiButton* buttonSelectAll;
16 GuiSelectableButton* checkReadonly;
17 GuiSinglelineTextBox* textGoto;
18 GuiButton* buttonGoto;
19 GuiMultilineTextBox* textDocument;
20
21 void UpdateEditButtonState()
22 {
23 buttonCut->SetEnabled(textDocument->CanCut());
24 buttonCopy->SetEnabled(textDocument->CanCopy());
25 buttonPaste->SetEnabled(textDocument->CanPaste());
26 }
27
28 // ensure that the buttonGoto is enabled only when textGoto's content is a positive number
29 void UpdateGotoButtonState()
30 {
31 buttonGoto->SetEnabled(utow(wtou(textGoto->GetText()))==textGoto->GetText() && wtou(textGoto->GetText())!=0);
32 }
33
34 // cut text box selection
35 void buttonCut_OnClicked(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
36 {
37 textDocument->Cut();
38 textDocument->SetFocus();
39 }
40
41 // copy text box selection
42 void buttonCopy_OnClicked(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
43 {
44 textDocument->Copy();
45 textDocument->SetFocus();
46 }
47
48 // paste text from clipboard
49 void buttonPaste_OnClicked(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
50 {
51 textDocument->Paste();
52 textDocument->SetFocus();
53 }
54
55 // select all text
56 void buttonSelectAll_OnClicked(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
57 {
58 textDocument->SelectAll();
59 textDocument->SetFocus();
60 }
61
62 // go to the specified line
63 void buttonGoto_OnClicked(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
64 {
65 int line=wtoi(textGoto->GetText())-1;
66 textDocument->Select(TextPos(line, 0), TextPos(line, 0));
67 textDocument->SetFocus();
68 }
69
70 // make the textbox readonly or not readonly
71 void checkReadonly_OnSelectedChanged(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
72 {
73 textDocument->SetReadonly(checkReadonly->GetSelected());
74 UpdateEditButtonState();
75 }
76
77 // when textGoto changed, disable buttonGoto if the text in the textGoto is failed to pass the validation
78 void textGoto_TextChanged(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
79 {
80 UpdateGotoButtonState();
81 }
82
83 // update the edit buttons when selection changed
84 void textDocument_SelectionChanged(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
85 {
86 UpdateEditButtonState();
87 }
88
89 // update the edit buttons when clipboard changed changed
90 void window_OnClipboardUpdated(GuiGraphicsComposition* sender, GuiEventArgs& arguments)
91 {
92 UpdateEditButtonState();
93 }
94 public:
95 TextBoxEditorWindow()
96 :GuiWindow(GetCurrentTheme()->CreateWindowStyle())
97 {
98 this->SetText(L"Controls.TextBox.Editor");
99 this->GetContainerComposition()->SetMinSizeLimitation(GuiGraphicsComposition::LimitToElementAndChildren);
100 this->ClipboardUpdated.AttachMethod(this, &TextBoxEditorWindow::window_OnClipboardUpdated);
101
102 GuiTableComposition* table=new GuiTableComposition;
103 table->SetAlignmentToParent(Margin(0, 0, 0, 0));
104 table->SetCellPadding(2);
105 table->SetRowsAndColumns(3, 1);
106 table->SetRowOption(0, GuiCellOption::MinSizeOption());
107 table->SetRowOption(1, GuiCellOption::MinSizeOption());
108 table->SetRowOption(2, GuiCellOption::PercentageOption(1.0));
109 table->SetColumnOption(0, GuiCellOption::PercentageOption(1.0));
110 this->GetContainerComposition()->AddChild(table);
111
112 {
113 GuiCellComposition* cell=new GuiCellComposition;
114 table->AddChild(cell);
115 cell->SetSite(0, 0, 1, 1);
116
117 GuiStackComposition* stack=new GuiStackComposition;
118 stack->SetMinSizeLimitation(GuiGraphicsComposition::LimitToElementAndChildren);
119 stack->SetPadding(2);
120 stack->SetAlignmentToParent(Margin(0, 0, 0, 0));
121 cell->AddChild(stack);
122
123 {
124 GuiStackItemComposition* item=new GuiStackItemComposition;
125 stack->AddChild(item);
126
127 buttonCut=g::NewButton();
128 buttonCut->SetText(L"Cut");
129 buttonCut->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
130 buttonCut->Clicked.AttachMethod(this, &TextBoxEditorWindow::buttonCut_OnClicked);
131 item->AddChild(buttonCut->GetBoundsComposition());
132 }
133 {
134 GuiStackItemComposition* item=new GuiStackItemComposition;
135 stack->AddChild(item);
136
137 buttonCopy=g::NewButton();
138 buttonCopy->SetText(L"Copy");
139 buttonCopy->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
140 buttonCopy->Clicked.AttachMethod(this, &TextBoxEditorWindow::buttonCopy_OnClicked);
141 item->AddChild(buttonCopy->GetBoundsComposition());
142 }
143 {
144 GuiStackItemComposition* item=new GuiStackItemComposition;
145 stack->AddChild(item);
146
147 buttonPaste=g::NewButton();
148 buttonPaste->SetText(L"Paste");
149 buttonPaste->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
150 buttonPaste->Clicked.AttachMethod(this, &TextBoxEditorWindow::buttonPaste_OnClicked);
151 item->AddChild(buttonPaste->GetBoundsComposition());
152 }
153 {
154 GuiStackItemComposition* item=new GuiStackItemComposition;
155 stack->AddChild(item);
156
157 buttonSelectAll=g::NewButton();
158 buttonSelectAll->SetText(L"Select All");
159 buttonSelectAll->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
160 buttonSelectAll->Clicked.AttachMethod(this, &TextBoxEditorWindow::buttonSelectAll_OnClicked);
161 item->AddChild(buttonSelectAll->GetBoundsComposition());
162 }
163 {
164 GuiStackItemComposition* item=new GuiStackItemComposition;
165 stack->AddChild(item);
166
167 checkReadonly=g::NewCheckBox();
168 checkReadonly->SetText(L"Readonly");
169 checkReadonly->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
170 checkReadonly->SelectedChanged.AttachMethod(this, &TextBoxEditorWindow::checkReadonly_OnSelectedChanged);
171 item->AddChild(checkReadonly->GetBoundsComposition());
172 }
173 }
174 {
175 GuiCellComposition* cell=new GuiCellComposition;
176 table->AddChild(cell);
177 cell->SetSite(1, 0, 1, 1);
178
179 GuiStackComposition* stack=new GuiStackComposition;
180 stack->SetMinSizeLimitation(GuiGraphicsComposition::LimitToElementAndChildren);
181 stack->SetPadding(2);
182 stack->SetAlignmentToParent(Margin(0, 0, 0, 0));
183 cell->AddChild(stack);
184
185 {
186 GuiStackItemComposition* item=new GuiStackItemComposition;
187 stack->AddChild(item);
188
189 textGoto=g::NewTextBox();
190 textGoto->GetBoundsComposition()->SetBounds(Rect(Point(0, 0), Size(180, 0)));
191 textGoto->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
192 textGoto->TextChanged.AttachMethod(this, &TextBoxEditorWindow::textGoto_TextChanged);
193 item->AddChild(textGoto->GetBoundsComposition());
194 }
195 {
196 GuiStackItemComposition* item=new GuiStackItemComposition;
197 stack->AddChild(item);
198
199 buttonGoto=g::NewButton();
200 buttonGoto->SetText(L"Go to this line");
201 buttonGoto->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
202 buttonGoto->Clicked.AttachMethod(this, &TextBoxEditorWindow::buttonGoto_OnClicked);
203 item->AddChild(buttonGoto->GetBoundsComposition());
204 }
205 }
206 {
207 GuiCellComposition* cell=new GuiCellComposition;
208 table->AddChild(cell);
209 cell->SetSite(2, 0, 1, 1);
210
211 textDocument=g::NewMultilineTextBox();
212 textDocument->GetBoundsComposition()->SetAlignmentToParent(Margin(0, 0, 0, 0));
213 textDocument->SelectionChanged.AttachMethod(this, &TextBoxEditorWindow::textDocument_SelectionChanged);
214 cell->AddChild(textDocument->GetBoundsComposition());
215 }
216
217 // make some buttons enabled or disabled appropiately
218 UpdateEditButtonState();
219 UpdateGotoButtonState();
220 // set the preferred minimum client size
221 this->GetBoundsComposition()->SetPreferredMinSize(Size(640, 480));
222 // call this to calculate the size immediately if any indirect content in the table changes
223 // so that the window can calcaulte its correct size before calling the MoveToScreenCenter()
224 this->ForceCalculateSizeImmediately();
225 // move to the screen center
226 this->MoveToScreenCenter();
227 }
228
229 ~TextBoxEditorWindow()
230 {
231 }
232 };
233
234 void GuiMain()
235 {
236 GuiWindow* window=new TextBoxEditorWindow();
237 GetApplication()->Run(window);
238 delete window;
239 }
GacUI將提供兩個(gè)文本框的Demo，這是第一個(gè)。GacUI的文本框從一開(kāi)始就具備了讓每一個(gè)字符的顏色可以不同的功能，下一個(gè)Demo將展示如何利用使用正則表達(dá)式構(gòu)建的詞法分析器（見(jiàn)
這里和
這里），讓文本框在編輯的時(shí)候，跟所有的代碼編輯器一樣，可以根據(jù)情況把不同的字符串染成不同的顏色。